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

llvm-svn: 74844
diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 2aeb0bb..2e52690 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -1178,6 +1178,7 @@
 /// ultimate destination.
 static bool FoldCondBranchOnPHI(BranchInst *BI) {
   BasicBlock *BB = BI->getParent();
+  LLVMContext* Context = BB->getContext();
   PHINode *PN = dyn_cast<PHINode>(BI->getCondition());
   // NOTE: we currently cannot transform this case if the PHI node is used
   // outside of the block.
@@ -1243,7 +1244,7 @@
           }
           
           // Check for trivial simplification.
-          if (Constant *C = ConstantFoldInstruction(N)) {
+          if (Constant *C = ConstantFoldInstruction(N, Context)) {
             TranslateMap[BBI] = C;
             delete N;   // Constant folded away, don't need actual inst
           } else {