Merging r338665:

Merging r338665:
------------------------------------------------------------------------
r338665 | lliu0 | 2018-08-02 03:54:12 +0200 (Thu, 02 Aug 2018) | 11 lines

Fix FCOPYSIGN expansion

In expansion of FCOPYSIGN, the shift node is missing when the two
operands of FCOPYSIGN are of the same size. We should always generate
shift node (if the required shift bit is not zero) to put the sign
bit into the right position, regardless of the size of underlying
types.

Differential Revision: https://reviews.llvm.org/D49973

------------------------------------------------------------------------

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_70@339098 91177308-0d34-0410-b5e6-96231b3b80d8