Reapply "[LLVM][LTO] Factor out RTLib calls and allow them to be dropped (#98512)"

This reverts commit 740161a9b98c9920dedf1852b5f1c94d0a683af5.

I moved the `ISD` dependencies into the CodeGen portion of the handling,
it's a little awkward but it's the easiest solution I can think of for
now.

1 files changed, 7 insertions, 8 deletions

diff --git a/llvm/lib/LTO/LTO.cpp b/llvm/lib/LTO/LTO.cpp
index 94db666..bb3c9f7 100644
--- a/llvm/lib/LTO/LTO.cpp
+++ b/llvm/lib/LTO/LTO.cpp
@@ -30,6 +30,7 @@
 #include "llvm/IR/LegacyPassManager.h"
 #include "llvm/IR/Mangler.h"
 #include "llvm/IR/Metadata.h"
+#include "llvm/IR/RuntimeLibcalls.h"
 #include "llvm/LTO/LTOBackend.h"
 #include "llvm/LTO/SummaryBasedOptimizations.h"
 #include "llvm/Linker/IRMover.h"
@@ -1357,14 +1358,12 @@ Error LTO::runRegularLTO(AddStreamFn AddStream) {
   return finalizeOptimizationRemarks(std::move(DiagnosticOutputFile));
 }
 
-static const char *libcallRoutineNames[] = {
-#define HANDLE_LIBCALL(code, name) name,
-#include "llvm/IR/RuntimeLibcalls.def"
-#undef HANDLE_LIBCALL
-};
-
-ArrayRef<const char *> LTO::getRuntimeLibcallSymbols() {
-  return ArrayRef(libcallRoutineNames);
+SmallVector<const char *> LTO::getRuntimeLibcallSymbols(const Triple &TT) {
+  RTLIB::RuntimeLibcallsInfo Libcalls(TT);
+  SmallVector<const char *> LibcallSymbols;
+  copy_if(Libcalls.getLibcallNames(), std::back_inserter(LibcallSymbols),
+          [](const char *Name) { return Name; });
+  return LibcallSymbols;
 }
 
 /// This class defines the interface to the ThinLTO backend.