Revert 18443d3a74d5: the branch int-test-is-zero is maybe a nice idea
but it doesn't really work. E.g. when we write "if a & 3:" at app-level then the value "a & 3" is anyway passed around as failargs. So this branch makes the CPU compute twice this value, basically. This is an almost-complete-revert: I'm keeping the new TEST_xx instructions in rx86.py because the next time they're needed we'll already have them.
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