Basic block optimization refactoring

Various optimization improvements for the common frontend.

Before applying basic block optimizations, split the graph
into extended basic blocks.  Replace existing pattern-match
range-check elimination with a scheme based on local value
numbering (which could also serve as the basis for some CSE
if the existing, but so-far untested, common frontend temp
register mechanism works as designed).

For the framework, this CL improves null check elimination
from 90.74% (statically) to 91.24% removed, and range
check elimination from 3.45% to 8.17%.

Change-Id: Ie1ce730cfe12a12fef665a30fe3814bad1993895

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