switch InlineInfo.DevirtualizedCalls's list to be of WeakVH.

This fixes a bug where calls inlined into an invoke would get
changed into an invoke but the array would keep pointing to
the (now dead) call.  The improved inliner behavior is still
disabled for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102196 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Utils/Cloning.h

@@ -21,6 +21,7 @@
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Twine.h"
+#include "llvm/Support/ValueHandle.h"
 
 namespace llvm {
 
@@ -178,7 +179,7 @@ public:
   /// DevirtualizedCalls - InlineFunction fills this in with callsites that were
   /// inlined from the callee that went from being indirect calls to direct
   /// calls due to inlining.  This is only filled in if CG is non-null.
-  SmallVector<Instruction*, 2> DevirtualizedCalls;
+  SmallVector<WeakVH, 2> DevirtualizedCalls;
   
   void reset() {
     StaticAllocas.clear();

lib/Transforms/IPO/Inliner.cpp

@@ -392,8 +392,10 @@ bool Inliner::runOnSCC(CallGraphSCC &SCC) {
         // onto our worklist to process.  They are useful inline candidates.
 #if 0
         for (unsigned i = 0, e = InlineInfo.DevirtualizedCalls.size();
-             i != e; ++i)
-          CallSites.push_back(CallSite(InlineInfo.DevirtualizedCalls[i]));
+             i != e; ++i) {
+          Value *Ptr = InlineInfo.DevirtualizedCalls[i];
+          CallSites.push_back(CallSite(Ptr));
+        }
 #endif
         
         // Update the cached cost info with the inlined call.

lib/Transforms/Utils/InlineFunction.cpp

@@ -72,7 +72,7 @@ static void HandleCallsInBlockInlinedThroughInvoke(BasicBlock *BB,
     II->setAttributes(CI->getAttributes());
     
     // Make sure that anything using the call now uses the invoke!  This also
-    // updates the CallGraph if present.
+    // updates the CallGraph if present, because it uses a WeakVH.
     CI->replaceAllUsesWith(II);
     
     // Delete the unconditional branch inserted by splitBasicBlock