Revert r318456 "Issue -Wempty-body warnings for else blocks"
This caused warnings also when the if or else comes from macros. There was an
attempt to fix this in r318556, but that introduced new problems and was
reverted. Reverting this too until the whole issue is sorted.
> This looks like it was just an oversight.
>
> Fixes http://llvm.org/pr35319
>
> git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@318456
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@318667
91177308-0d34-0410-b5e6-
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