runtime: sigtramp seems wrong in sys_linux_arm.s #32738
As in issue #31827, the callee saved register should be saved/restored in sigtramp.
The callee saved registers are handled in sigtramp of sys_darwin_arm.s, but not in sys_linux _arm.s / sys_openbsd_arm.s / sys_netbsd_arm.s.
Though tsan_test.go passed on arm, there are still potential risks.
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