Arm64: Optimize pairs of "str wzr" to "str xzr" (#84350)
Optimise following patterns ``` stp wzr, wzr, [x2, #0x08] => str xzr, [x2, #0x08] ``` and ``` stp wzr, wzr, [x14, #0x20] str xzr, [x14, #0x18] => stp xzr, xzr, [x14, #0x18] ```
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