Recommit r299321 '[X86] Add __extension__ to f16c macro intrinsics to suppress warnings about compound literals when compiled for with earlier language standards enabled.'
Recommit r299321 '[X86] Add __extension__ to f16c macro intrinsics to suppress warnings about compound literals when compiled for with earlier language standards enabled.'

The bot didn't recover after the revert. So it looks like this wasn't the issue.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@299397 91177308-0d34-0410-b5e6-96231b3b80d8

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