[llvm] [X86] Added ComputeKnownBits support for BEXTR (PR #199558)

[Simon Pilgrim via llvm-commits]

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+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+sse2,+bmi,+tbm | FileCheck %s --check-prefixes=X64
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RKSimon wrote:

delete this file

https://github.com/llvm/llvm-project/pull/199558