split the slow path out of Lexer::getSourceLocation and do not let the
compiler inline it.  This speeds up -Eonly on 483.xalancbmk by about 1%


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40393 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed