MergeBlocks: Migrate from invalidates to orderedBefore#8767
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Replace the coarse 'invalidates' check in 'MergeBlocks' with 'orderedBefore'. This allows 'MergeBlocks' to move expressions (like GC reads) out of blocks past other sibling expressions that have been left behind. Also clean up dead code in 'optimize()' by removing the unused 'dependency1' and 'dependency2' parameters and their checks (which were the other two replaced 'invalidates' calls that are no longer active). TAG=agy
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Replace the coarse 'invalidates' check in 'MergeBlocks' with 'orderedBefore'. This allows 'MergeBlocks' to move expressions (like GC reads) out of blocks past other sibling expressions that have been left behind.
Also clean up dead code in 'optimize()' by removing the unused 'dependency1' and 'dependency2' parameters and their checks (which were the other two replaced 'invalidates' calls that are no longer active).
TAG=agy