Merging r353411:

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r353411 | erichkeane | 2019-02-07 16:14:11 +0100 (Thu, 07 Feb 2019) | 7 lines

Fix r350643 to limit COFF emission to <= 32 BYTES instead of BITS.

The patch in r350643 incorrectly sets the COFF emission based on bits
instead of bytes. This patch converts the 32 via CharUnits to bits to
compare the correct values.

Change-Id: Icf38a16470ad5ae3531374969c033557ddb0d323
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llvm-svn: 353825