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[X86] Improve lowering of fptoui

Authored by craig.topper on Nov 7 2020, 10:44 PM.

Description

[X86] Improve lowering of fptoui

Invert the select condition when masking in the sign bit of a fptoui operation. Also, rather than lowering the sign mask to select/xor and expecting the select to get cleaned up later, directly lower to shift/xor.

Patch by Layton Kifer!

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D90658