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[MIPS] Fix missing ANDI optimization (#97689)
1. Add MipsPat to optimize (andi (srl (truncate i64 $1), x), y) to (andi (truncate (dsrl i64 $1, x)), y). 2. Add MipsPat to optimize (ext (truncate i64 $1), x, y) to (truncate (dext i64 $1, x, y)). The assembly result is the same as gcc. Fixes #42826
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