[dev.garbage] runtime: mark/allocation helper functions
The gcmarkBits is a bit vector used by the GC to mark reachable objects. Once a GC cycle is complete the gcmarkBits swap places with the allocBits. allocBits is then used directly by malloc to locate free objects, thus avoiding the construction of a linked free list. This CL introduces a set of helper functions for manipulating gcmarkBits and allocBits that will be used by later CLs to realize the actual algorithm. Minimal attempts have been made to optimize these helper routines. Change-Id: I55ad6240ca32cd456e8ed4973c6970b3b882dd34 Reviewed-on: https://go-review.googlesource.com/19420Reviewed-by: Austin Clements <austin@google.com> Run-TryBot: Rick Hudson <rlh@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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