Matt Arsenault 5a321b899e GlobalISel: Use the original flags when lowering fneg to fsub ...

This was ignoring the flag on fneg, and using the source instruction's
flags. Also fixes tests missing from r358702.

Note the expansion itself isn't correct without nnan, but that should
be fixed separately.

llvm-svn: 363637

2019-06-17 23:48:43 +00:00

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