Thread LLVMContext through the constant folding APIs, which touches a lot of files.

llvm-svn: 74844
diff --git a/llvm/lib/Transforms/Utils/UnrollLoop.cpp b/llvm/lib/Transforms/Utils/UnrollLoop.cpp
index caef7ec..6b012f6 100644
--- a/llvm/lib/Transforms/Utils/UnrollLoop.cpp
+++ b/llvm/lib/Transforms/Utils/UnrollLoop.cpp
@@ -349,7 +349,8 @@
 
       if (isInstructionTriviallyDead(Inst))
         (*BB)->getInstList().erase(Inst);
-      else if (Constant *C = ConstantFoldInstruction(Inst)) {
+      else if (Constant *C = ConstantFoldInstruction(Inst, 
+                                                     Header->getContext())) {
         Inst->replaceAllUsesWith(C);
         (*BB)->getInstList().erase(Inst);
       }