Qubit Kernel Optimizations#200
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This combines the qpp_bench-focused qubit kernel optimizations that were developed on top of origin/dev. It fixes the OpenMP collapse pragma, adds a fast path for single-control diagonal phase gates, streams the QFT phase pattern over contiguous amplitude runs, and specializes Hadamard updates as scaled sums and differences. Together these changes make the native qpp backend faster than PennyLane Lightning on the repeated qpp_bench QFT sweep from 18 through 26 qubits.
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This combines the qpp_bench-focused qubit kernel optimizations that were developed on top of origin/dev. It fixes the OpenMP collapse pragma, adds a fast path for single-control diagonal phase gates, streams the QFT phase pattern over contiguous amplitude runs, and specializes Hadamard updates as scaled sums and differences.