PowIStrengthReduction::matchAndRewrite was creating the `one` constant
(using complex::ConstantOp::create for complex::PowiOp) before the
threshold check that guards whether the rewrite is profitable. When the
exponent exceeds the threshold, the pattern returned failure() after IR
was already modified, violating
MLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS.
Fix: reorder so the abs(exponent) computation and threshold check occur
before any IR creation.
Assisted-by: Claude Code
Fix a failure present with MLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS=ON.
8a42e2ffc5