[CODEGEN][METAL] Fix unaligned vector load #14332
Merged
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This PR fixes the implementation of unaligned vector load. Previously vector construction was printed as (float2)(v0, v1). This will cause problem as C have comma expression, and (v0, v1) will be evaluated as v1. The final result will become float2(v1, v1). The bug affects all codegen that uses the default implementation, such as metal. We added a testcase on metal to cover this case.