ART: Run GraphChecker after Builder and SsaBuilder

This patch refactors the way GraphChecker is invoked, utilizing the
same scoping mechanism as pass timing and graph visualizer. Therefore,
GraphChecker will now run not just after instances of HOptimization
but after the builders and reg alloc, too.

Change-Id: I8173b98b79afa95e1fcbf3ac9630a873d7f6c1d4