feat(instrumenter): add BitwiseOperator mutator#6088
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Adds a new BitwiseOperator mutator that handles binary bitwise expressions (BinaryExpression nodes): & → |, | → &, ^ → &, << → >>, >> → <<, >>> → >>. Also completes the bitwise assignment operator coverage in AssignmentOperator by adding the two previously missing entries: ^= → &= and >>>= → >>=. Updates the benchmark-big.ts perf test expected mutant count from 933 to 946 (+13), accounting for 12 new binary bitwise mutants and 1 new ^= assignment mutant introduced in that fixture.
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Adds a
BitwiseOperatormutator for the binary bitwise operators, which PIT and Stryker.NET already mutate but StrykerJS did not:&↔|<<↔>>^→&>>>→>>Mappings follow the existing
AssignmentOperatorstyle (one target per operator). This PR also adds the two bitwise compound-assignment operators thatAssignmentOperatorwas missing:^=→&=and>>>=→>>=.