[patch] Change the .ll syntax for comdats and add a syntactic sugar

[Rafael Espíndola]

>> It keeps it nice and terse when possible and we only need to check if the
>> next token after comdat is '(' to see if it is in an explicit comdat group.
>
> I like it. I will post a patch with it.

llvm and clang patches attached. What do you think?
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