Merging r324916:

Merging r324916:
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r324916 | junbuml | 2018-02-12 18:56:55 +0100 (Mon, 12 Feb 2018) | 7 lines

[LICM] update BlockColors after splitting predecessors

Update BlockColors after splitting predecessors. Do not allow splitting
EHPad for sinking when the BlockColors is not empty, so we can
simply assign predecessor's color to the new block.

Fixes PR36184
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@325507 91177308-0d34-0410-b5e6-96231b3b80d8