Fix scope location when parsing GNU attributes.

For GNU attributes, instead of reusing attribute source 
location for the scope location, use SourceLocation() since 
GNU attributes don not have scope tokens. 



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165234 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed