Several related changes:

1) implement parser and sema support for reading and verifying attribute(warnunusedresult).
2) rename hasLocalSideEffect to isUnusedResultAWarning, inverting the sense
   of its result.
3) extend isUnusedResultAWarning to directly return the loc and range 
   info that should be reported to the user.  Make it substantially more
   precise in some cases than what was previously reported.
4) teach isUnusedResultAWarning about CallExpr to decls that are 
   pure/const/warnunusedresult, fixing a fixme.
5) change warn_attribute_wrong_decl_type to not pass in english strings, instead,
   pass in integers and use %select.

llvm-svn: 64543

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