[cfe-commits] [Patch] fix for PR4997

[Anton Yartsev]

This fixes PR4997 (http://llvm.org/bugs/show_bug.cgi?id=4997)
Made the processing of all attributes(according to clang tests) with an 
identifier as a first argument treated as a parameter name the special 
case. The common case now is to treat an identifier as an argument. It 
eliminates inadequate error messages.
The case with a template argument as an attribute argument is not 
included in the testcases as there seem to be an additional issue there.

Warning: IsThreadSafetyAttribute and ParseThreadSafetyAttribute methods 
are now unused.

Please review!

-- 
Anton

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