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This makes the code simpler, and avoids problems with the two directions
interfering with each other. This fixes asm2.test_sqlite and other failures.
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1006301.
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Avoid infinite looping in AllocaManager::computeInterBlockLiveness,
without using new temporary variables. This also makes it clear that
the algorithm is conservative in the face of conflicting liveness
intrinsics.
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The AllocaManager performs stack layout for alloca objects. It is capable
of analyzing alloca liveness and sharing space between multiple allocas.
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