runtime: don't ignore address hint for sysReserve in Plan 9 On Plan 9, sysReserve was ignoring the address hint and allocating memory wherever it is available. This causes the new TestArenaCollision test to fail on 32-bit Plan 9. We now use the address hint in the specific case where sysReserve is extending the process address space at its end, and similarly we contract the address space in the case where sysFree is releasing memory at the end. Fixes #23860 Change-Id: Ia5254779ba8f1698c999832720a88de400b5f91a Reviewed-on: https://go-review.googlesource.com/94776 Reviewed-by: Austin Clements <austin@google.com> Reviewed-by: David du Colombier <0intro@gmail.com>
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