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Add rsqrt op to Standard dialect and lower it to LLVM dialect.

Authored by akuegel on Feb 28 2020, 6:57 AM.

Description

Add rsqrt op to Standard dialect and lower it to LLVM dialect.

Summary:
This adds an rsqrt op to the standard dialect, and lowers
it as 1 / sqrt to the LLVM dialect.

Differential Revision: https://reviews.llvm.org/D75353