gh-99955: use SUCCESS/ERROR return values in optimizer and assembler. Use RETURN_IF_ERROR where appropriate. Fix a couple of bugs. #101412
+142
−189
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Fixes #99955.
This should be the last sweep of the error handling code.
Also fixes bugs in NEW_JUMP_TARGET_LABEL, USE_LABEL which returned 0 for error, and in compiler_lambda which did the same in one place.