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cmd/internal/obj: wrong code generated by the arm assembler #19141

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@benshi001

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@benshi001

The MULA is wrongly assembled by the ARM assembler, even the newest go.

For example, MULA r1, r2, r3, r4 is assembled to e0 23 41 92, which should be e0 24 31 92.

The addend is r3 and the result is r4, the assembler confuses them.

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