Fix a really nasty bug that was breaking ijpeg in LLC mode. We were incorrectly

folding load instructions into other instructions across free instruction
boundaries.  Perhaps this will also fix the other strange failures?

llvm-svn: 12494

lib/Target/X86/InstSelectSimple.cpp

@@ -1422,6 +1422,8 @@ static bool isSafeToFoldLoadIntoInstruction(LoadInst &LI, Instruction &User) {
   // really use alias analysis here, but for now we just do something simple.
   for (++It; It != BasicBlock::iterator(&User); ++It) {
     switch (It->getOpcode()) {
+    case Instruction::Malloc:
+    case Instruction::Free:
     case Instruction::Store:
     case Instruction::Call:
     case Instruction::Invoke: