runtime: eliminate most uses of mheap_.arena_*
This replaces all uses of the mheap_.arena_* fields outside of mallocinit and sysAlloc. These fields fundamentally assume a contiguous heap between two bounds, so eliminating these is necessary for a sparse heap. Many of these are replaced with checks for non-nil spans at the test address (which in turn checks for a non-nil entry in the heap arena array). Some of them are just for debugging and somewhat meaningless with a sparse heap, so those we just delete. Updates #10460. Change-Id: I8345b95ffc610aed694f08f74633b3c63506a41f Reviewed-on: https://go-review.googlesource.com/85886 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Rick Hudson <rlh@golang.org>
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