X87: [turbofan] Implemented the optional Float32RoundTiesEven operator.
port 57117b83 (r32308) original commit message: The Float32RoundTiesEven operator rounds float32 numbers towards the nearest integer. If the distance to two integers is the same, then the result is the even integer. This is the default rounding mode of the ieee 754 floating point standard. I implemented the optional Float32RoundTiesEven operator on x64, ia32, arm, and arm64. BUG= Review URL: https://codereview.chromium.org/1492293002 Cr-Commit-Position: refs/heads/master@{#32595}
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