runtime: use internal/cpu.X86.HasAVX2 instead of support_avx2
After CL 104636 cpu.X86.HasAVX is set early enough that it can be used in runtime·memclrNoHeapPointers. Add an offset to use in assembly and replace the only occurence of support_avx2. Change-Id: Icada62efeb3e24d71251d55623a8a8602364c9a8 Reviewed-on: https://go-review.googlesource.com/106595 Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by:
Ilya Tocar <ilya.tocar@intel.com>
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