cmd/internal/obj/arm: better solution of .S/.P/.U/.W suffix check
Current suffix check is based on instruction, which is not very accurate. For example, "MOVW.S R1, R2" is valid, but "MOVW.S $0xaaaaaaaa, R1" and "MOVW.P CPSR, R9" are not. This patch fixes the above kinds of issues by checking suffix based on []optab. And also more test cases are added. fixes #20509 Change-Id: Ibad91be72c78eefa719412a83b4d44370d2202a8 Reviewed-on: https://go-review.googlesource.com/70910 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Cherry Zhang <cherryyz@google.com>
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