Reapply "[dart2js] Replace phi with controlling condition" This reverts commit aec3ec0244c28a1f637f965e9a72587c068e3527. - Corrected 'controlling condition' detection. - Added test that is incorrectly compiled to infinite loop with incorrect controlling condition detection. See https://github.com/dart-lang/sdk/issues/54115#issuecomment-1944285230 for an image of part of the CFG for `doWhileLoop` where the condition in B4 was previously mis-identified as controlling `phi(true,false)` at B12. Issue: #54115 Change-Id: I0d2c2ff83b202071f6d7050d34de8ff25d05cb22 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/352443 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Stephen Adams <sra@google.com>
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