gdb: LoongArch: prepend tramp frame unwinder for signal
Implement the "init" method of struct tramp_frame to prepend tramp
frame unwinder for signal on LoongArch.
With this patch, the following failed testcases can be fixed:
FAIL: gdb.base/annota1.exp: backtrace @ signal handler (timeout)
FAIL: gdb.base/annota3.exp: backtrace @ signal handler (pattern 2)
Signed-off-by:
Tiezhu Yang <yangtiezhu@loongson.cn>
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