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Improved cost model for FDIV and FSQRT, by Andrew Tischenko

Authored by ABataev on Oct 31 2016, 5:10 AM.

Description

Improved cost model for FDIV and FSQRT, by Andrew Tischenko

There is a bug describing poor cost model for floating point operations:
Bug 29083 - [X86][SSE] Improve costs for floating point operations. This
patch is the second one in series of patches dealing with cost model.

Differential Revision: https://reviews.llvm.org/D25722

llvm-svn: 285564

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