[turbofan] Add the RoundInt32ToFloat32 operator to turbofan.
The new operator converts an int32 input to float32. If the input cannot be represented exactly in float32, the value is rounded using the round-ties-even rounding mode (the default rounding mode). I provide implementations of the new operator for x64, ia32, arm, arm64, mips, mips64, ppc, and ppc64. R=titzer@chromium.org, v8-arm-ports@googlegroups.com, v8-mips-ports@googlegroups.com, v8-ppc-ports@googlegroups.com Review URL: https://codereview.chromium.org/1589363002 Cr-Commit-Position: refs/heads/master@{#33347}
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