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I realized I was missing a test case for a local store early in a loop
that was unused but turned out to be a clobber of a store later in the
loop.
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When an unused store clobbers a previous store, replace it with storing
a null. Don't mark clobbers as "used" so that the original clobber and
all following clobbers can still be eliminated.
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Storing to local variables of reference or array type is indirectly
observable because it potentially allows gc to collect an object. So
this commit makes DeadCodeElimination mark a store necessary if it
assigns to a local that potentially stored by a previous necessary store.
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