Auto-upgrade free instructions to calls to the builtin free function.

Update all analysis passes and transforms to treat free calls just like FreeInst.
Remove RaiseAllocations and all its tests since FreeInst no longer needs to be raised.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84987 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/Local.cpp

@@ -24,6 +24,7 @@
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/DebugInfo.h"
+#include "llvm/Analysis/MallocHelper.h"
 #include "llvm/Analysis/ProfileInfo.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Support/GetElementPtrTypeIterator.h"
@@ -59,7 +60,7 @@ bool llvm::isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom) {
 
     // If we see a free or a call which may write to memory (i.e. which might do
     // a free) the pointer could be marked invalid.
-    if (isa<FreeInst>(BBI) || 
+    if (isa<FreeInst>(BBI) || isFreeCall(BBI) ||
         (isa<CallInst>(BBI) && BBI->mayWriteToMemory() &&
          !isa<DbgInfoIntrinsic>(BBI)))
       return false;

lib/Transforms/Utils/LowerAllocations.cpp

@@ -102,12 +102,8 @@ bool LowerAllocations::runOnBasicBlock(BasicBlock &BB) {
   // Loop over all of the instructions, looking for free instructions
   for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I) {
     if (FreeInst *FI = dyn_cast<FreeInst>(I)) {
-      Value *PtrCast = 
-        new BitCastInst(FI->getOperand(0),
-               Type::getInt8PtrTy(BB.getContext()), "", I);
-
       // Insert a call to the free function...
-      CallInst::Create(FreeFunc, PtrCast, "", I)->setTailCall();
+      CallInst::CreateFree(FI->getOperand(0), I);
 
       // Delete the old free instruction
       I = --BBIL.erase(I);