cmd/dist, cmd/8g: implement GO386=387/sse to choose FPU flavour.
A new environment variable GO386 is introduced to choose between code generation targeting 387 or SSE2. No auto-detection is performed and the setting defaults to 387 to preserve previous behaviour. The patch is a reorganization of CL6549052 by rsc. Fixes #3912. R=minux.ma, rsc CC=golang-dev https://golang.org/cl/6962043
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