Merging r293230:

Merging r293230:
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r293230 | yuyichao | 2017-01-26 15:50:18 -0800 (Thu, 26 Jan 2017) | 11 lines

CMake is funky on detecting Intel 17 as GCC compatible.

Summary: This adds a fallback in case that the Intel compiler is failed to be detected correctly.

Reviewers: chapuni

Reviewed By: chapuni

Subscribers: llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D27610
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_40@293780 91177308-0d34-0410-b5e6-96231b3b80d8