JIT: Disallow 0-sized block ops (#83224)
Avoid creating 0-sized block ops in the importer (but keep the side effects of the addresses). Add asserts that we don't create these nodes and get rid of some downstream checks for the case. Fix #12807 Also merge CEE_INITBLK and CEE_CPBLK importer cases. As part of this fix a bug where we weren't setting GTF_EXCEPT on the destination in the CEE_INITBLK case.
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