[turbofan] Implemented the TruncateFloat32ToInt64 TurboFan operator.
The TruncateFloat32ToInt64 operator converts a float32 to an int64 using the round-to-zero rounding mode (truncate). If the input value is outside the int64 range, then the result depends on the architecture. I implemented the operator on x64, arm64, and mips64. R=titzer@chromium.org, jacob.bramley@arm.com Review URL: https://codereview.chromium.org/1476063002 Cr-Commit-Position: refs/heads/master@{#32315}
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