comment parsing: when property accessors don't have comment
of their own (or are syntheszed), use prperty's comment.
for them. // rdar://12791315


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@172278 91177308-0d34-0410-b5e6-96231b3b80d8
Fix -Wunused-comparison for comparisons in arguments to function-like macros.

Previously, -Wunused-comparison ignored comparisons in both macro bodies and
macro arguments, but we would still emit a -Wunused-value warning for either.
Now we correctly emit -Wunused-comparison for expressions in macro arguments.

Also, add isMacroBodyExpansion to SourceManager, to go along with
isMacroArgExpansion.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@172279 91177308-0d34-0410-b5e6-96231b3b80d8