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[RISCV] Add seto pattern expansion

Authored by luismarques on Apr 1 2019, 2:54 AM.

Description

[RISCV] Add seto pattern expansion

Adds a seto pattern expansion. Without it the lowerings of fcmp one and
fcmp ord would be inefficient due to an unoptimized double negation.

Differential Revision: https://reviews.llvm.org/D59699

llvm-svn: 357378

Details