In StringLiteralParser::init(), fail gracefully if the string is
not as we expect; it may be due to racing issue of a file coming from PCH
changing after the PCH is loaded.

rdar://11353109

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156043 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed