In StringLiteral::setString make sure that we copy the number of

bytes of the buffer and not the size of the string, otherwise we
may overwrite the buffer if there is a mismatch between the size
of the string and the CharByteWidth, and assertions are disabled.

The bug where this could occur was fixed in r163931.
Related to rdar://12069503

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163939 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/Expr.cpp

@@ -784,19 +784,19 @@ void StringLiteral::setString(ASTContext &C, StringRef Str,
   switch(CharByteWidth) {
     case 1: {
       char *AStrData = new (C) char[Length];
-      std::memcpy(AStrData,Str.data(),Str.size());
+      std::memcpy(AStrData,Str.data(),Length*sizeof(*AStrData));
       StrData.asChar = AStrData;
       break;
     }
     case 2: {
       uint16_t *AStrData = new (C) uint16_t[Length];
-      std::memcpy(AStrData,Str.data(),Str.size());
+      std::memcpy(AStrData,Str.data(),Length*sizeof(*AStrData));
       StrData.asUInt16 = AStrData;
       break;
     }
     case 4: {
       uint32_t *AStrData = new (C) uint32_t[Length];
-      std::memcpy(AStrData,Str.data(),Str.size());
+      std::memcpy(AStrData,Str.data(),Length*sizeof(*AStrData));
       StrData.asUInt32 = AStrData;
       break;
     }