CodeGen: Remove MachineFunctionAnalysis => Enable (Machine)ModulePasses

Re-apply this commit with the deletion of a MachineFunction delegated to
a separate pass to avoid use after free when doing this directly in
AsmPrinter.

This patch removes the MachineFunctionAnalysis. Instead we keep a
map from IR Function to MachineFunction in the MachineModuleInfo.

This allows the insertion of ModulePasses into the codegen pipeline
without breaking it because the MachineFunctionAnalysis gets dropped
before a module pass.

Peak memory should stay unchanged without a ModulePass in the codegen
pipeline: Previously the MachineFunction was freed at the end of a codegen
function pipeline because the MachineFunctionAnalysis was dropped; With
this patch the MachineFunction is freed after the AsmPrinter has
finished.

Differential Revision: http://reviews.llvm.org/D23736

llvm-svn: 279564

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/unittests/MI/LiveIntervalTest.cpp b/llvm/unittests/MI/LiveIntervalTest.cpp
index 12c3ad6..5fe5c91 100644
--- a/llvm/unittests/MI/LiveIntervalTest.cpp
+++ b/llvm/unittests/MI/LiveIntervalTest.cpp
@@ -70,8 +70,7 @@ std::unique_ptr<Module> parseMIR(LLVMContext &Context,
     return nullptr;
 
   const LLVMTargetMachine &LLVMTM = static_cast<const LLVMTargetMachine&>(TM);
-  LLVMTM.addMachineModuleInfo(PM);
-  LLVMTM.addMachineFunctionAnalysis(PM, MIR.get());
+  LLVMTM.addMachineModuleInfo(PM, MIR.get());
 
   return M;
 }