Thorsten Schütt ccfe7d4b20 [GlobalIsel] Cleanup G_EXTRACT_VECTOR_ELT combines (#109047) ...

Reduce duplicated build vector patterns by exploiting variadic args.
Make index parameter const to improve hit rate.
Use `getIConstantFromReg` to retrieve immediate because they are not
fallible anymore.
Improve extraction from build vector and shuffle vector.

2024-09-19 20:36:33 +02:00

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