Optimize sanitizerRuntimeDepsMutator

sanitizerRuntimeDepsMutator only modifies the currently visited
module, it can visit modules in parallel.

Also, stop recursing into modules that are not static dependencies,
and stop recursing if the module already has all modifications that
the mutator could make.

Test: m checkbuild
Change-Id: I95a57f763a91940f1854ba3c587a2f70e8baba97