runtime: add benchmark of heapBitsSetType
There was an old benchmark that measured this indirectly via allocation, but I don't understand how to factor out the allocation cost when interpreting the numbers. Replace with a benchmark that only calls heapBitsSetType, that does not allocate. This was not possible when the benchmark was first written, because heapBitsSetType had not been factored out of mallocgc. Change-Id: I30f0f02362efab3465a50769398be859832e6640 Reviewed-on: https://go-review.googlesource.com/9701Reviewed-by:Austin Clements <austin@google.com>
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