[analyzer] CheckerContext::getPredecessor() cleanup

Remove unnecessary calls to CheckerContext::getPredecessor() + Comments.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143513 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp b/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
index 944bff6..914b806 100644
--- a/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
@@ -307,8 +307,8 @@
   }
 
   // Other cases: check if sizeof(return type) > sizeof(void*)
-  if (CanRetTy != Ctx.VoidTy &&
-      C.getPredecessor()->getParentMap().isConsumedExpr(msg.getOriginExpr())) {
+  if (CanRetTy != Ctx.VoidTy && C.getLocationContext()->getParentMap()
+                                  .isConsumedExpr(msg.getOriginExpr())) {
     // Compute: sizeof(void *) and sizeof(return type)
     const uint64_t voidPtrSize = Ctx.getTypeSize(Ctx.VoidPtrTy);
     const uint64_t returnTypeSize = Ctx.getTypeSize(CanRetTy);