[RemoveDIs] Reapply 3fda50d3915, insert instructions using iterators

I'd reverted this in 6c7805d5d1 after a bad stage. Original commit
messsage follows:

[NFC][RemoveDIs] Bulk update utilities to insert with iterators

As part of the RemoveDIs project we need LLVM to insert instructions using
iterators wherever possible, so that the iterators can carry a bit of
debug-info. This commit implements some of that by updating the contents of
llvm/lib/Transforms/Utils to always use iterator-versions of instruction
constructors.

There are two general flavours of update:
 * Almost all call-sites just call getIterator on an instruction
 * Several make use of an existing iterator (scenarios where the code is
   actually significant for debug-info)
The underlying logic is that any call to getFirstInsertionPt or similar
APIs that identify the start of a block need to have that iterator passed
directly to the insertion function, without being converted to a bare
Instruction pointer along the way.

I've also switched DemotePHIToStack to take an optional iterator: it needs
to take an iterator, and having a no-insert-location behaviour appears to
be important. The constructors for ICmpInst and FCmpInst have been updated
too. They're the only instructions that take block _references_ rather than
pointers for certain calls, and a future patch is going to make use of
default-null block insertion locations.

All of this should be NFC.

1 files changed, 9 insertions, 9 deletions

diff --git a/llvm/lib/Transforms/Utils/InlineFunction.cpp b/llvm/lib/Transforms/Utils/InlineFunction.cpp
index f68fdb2..0e8e726 100644
--- a/llvm/lib/Transforms/Utils/InlineFunction.cpp
+++ b/llvm/lib/Transforms/Utils/InlineFunction.cpp
@@ -689,7 +689,7 @@ static void HandleInlinedEHPad(InvokeInst *II, BasicBlock *FirstNewBlock,
     if (auto *CRI = dyn_cast<CleanupReturnInst>(BB->getTerminator())) {
       if (CRI->unwindsToCaller()) {
         auto *CleanupPad = CRI->getCleanupPad();
-        CleanupReturnInst::Create(CleanupPad, UnwindDest, CRI);
+        CleanupReturnInst::Create(CleanupPad, UnwindDest, CRI->getIterator());
         CRI->eraseFromParent();
         UpdatePHINodes(&*BB);
         // Finding a cleanupret with an unwind destination would confuse
@@ -737,7 +737,7 @@ static void HandleInlinedEHPad(InvokeInst *II, BasicBlock *FirstNewBlock,
         auto *NewCatchSwitch = CatchSwitchInst::Create(
             CatchSwitch->getParentPad(), UnwindDest,
             CatchSwitch->getNumHandlers(), CatchSwitch->getName(),
-            CatchSwitch);
+            CatchSwitch->getIterator());
         for (BasicBlock *PadBB : CatchSwitch->handlers())
           NewCatchSwitch->addHandler(PadBB);
         // Propagate info for the old catchswitch over to the new one in
@@ -972,7 +972,7 @@ static void PropagateOperandBundles(Function::iterator InlinedBB,
     I->getOperandBundlesAsDefs(OpBundles);
     OpBundles.emplace_back("funclet", CallSiteEHPad);
 
-    Instruction *NewInst = CallBase::Create(I, OpBundles, I);
+    Instruction *NewInst = CallBase::Create(I, OpBundles, I->getIterator());
     NewInst->takeName(I);
     I->replaceAllUsesWith(NewInst);
     I->eraseFromParent();
@@ -2002,7 +2002,7 @@ inlineRetainOrClaimRVCalls(CallBase &CB, objcarc::ARCInstKind RVCallKind,
       Value *BundleArgs[] = {*objcarc::getAttachedARCFunction(&CB)};
       OperandBundleDef OB("clang.arc.attachedcall", BundleArgs);
       auto *NewCall = CallBase::addOperandBundle(
-          CI, LLVMContext::OB_clang_arc_attachedcall, OB, CI);
+          CI, LLVMContext::OB_clang_arc_attachedcall, OB, CI->getIterator());
       NewCall->copyMetadata(*CI);
       CI->replaceAllUsesWith(NewCall);
       CI->eraseFromParent();
@@ -2326,7 +2326,7 @@ llvm::InlineResult llvm::InlineFunction(CallBase &CB, InlineFunctionInfo &IFI,
           OpDefs.emplace_back("deopt", std::move(MergedDeoptArgs));
         }
 
-        Instruction *NewI = CallBase::Create(ICS, OpDefs, ICS);
+        Instruction *NewI = CallBase::Create(ICS, OpDefs, ICS->getIterator());
 
         // Note: the RAUW does the appropriate fixup in VMap, so we need to do
         // this even if the call returns void.
@@ -2479,7 +2479,7 @@ llvm::InlineResult llvm::InlineFunction(CallBase &CB, InlineFunctionInfo &IFI,
           SmallVector<Value *, 6> Params(CI->args());
           Params.append(VarArgsToForward.begin(), VarArgsToForward.end());
           CallInst *NewCI = CallInst::Create(
-              CI->getFunctionType(), CI->getCalledOperand(), Params, "", CI);
+              CI->getFunctionType(), CI->getCalledOperand(), Params, "", CI->getIterator());
           NewCI->setDebugLoc(CI->getDebugLoc());
           NewCI->setAttributes(Attrs);
           NewCI->setCallingConv(CI->getCallingConv());
@@ -2776,7 +2776,7 @@ llvm::InlineResult llvm::InlineFunction(CallBase &CB, InlineFunctionInfo &IFI,
     // If the call site was an invoke instruction, add a branch to the normal
     // destination.
     if (InvokeInst *II = dyn_cast<InvokeInst>(&CB)) {
-      BranchInst *NewBr = BranchInst::Create(II->getNormalDest(), &CB);
+      BranchInst *NewBr = BranchInst::Create(II->getNormalDest(), CB.getIterator());
       NewBr->setDebugLoc(Returns[0]->getDebugLoc());
     }
 
@@ -2813,7 +2813,7 @@ llvm::InlineResult llvm::InlineFunction(CallBase &CB, InlineFunctionInfo &IFI,
   if (InvokeInst *II = dyn_cast<InvokeInst>(&CB)) {
 
     // Add an unconditional branch to make this look like the CallInst case...
-    CreatedBranchToNormalDest = BranchInst::Create(II->getNormalDest(), &CB);
+    CreatedBranchToNormalDest = BranchInst::Create(II->getNormalDest(), CB.getIterator());
 
     // Split the basic block.  This guarantees that no PHI nodes will have to be
     // updated due to new incoming edges, and make the invoke case more
@@ -2881,7 +2881,7 @@ llvm::InlineResult llvm::InlineFunction(CallBase &CB, InlineFunctionInfo &IFI,
     DebugLoc Loc;
     for (unsigned i = 0, e = Returns.size(); i != e; ++i) {
       ReturnInst *RI = Returns[i];
-      BranchInst* BI = BranchInst::Create(AfterCallBB, RI);
+      BranchInst* BI = BranchInst::Create(AfterCallBB, RI->getIterator());
       Loc = RI->getDebugLoc();
       BI->setDebugLoc(Loc);
       RI->eraseFromParent();