Use StringLiteral::getBytes(), not StringLiteral::getString(), when profiling the expression, so that it works for non-UTF8 strings.

llvm-svn: 143550
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index 93b2f65..db97e59 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -275,7 +275,7 @@
 
 void StmtProfiler::VisitStringLiteral(const StringLiteral *S) {
   VisitExpr(S);
-  ID.AddString(S->getString());
+  ID.AddString(S->getBytes());
   ID.AddInteger(S->getKind());
 }