* gdb.base/sigall.exp (signals): New list.
<top level>: Loop over signals in the $signals list instead of
calling a test function once per signal.
* gdb.reverse/sigall-precsave.exp (signals): New list.
<top level>: Loop over signals in the $signals list instead of
calling a test function once per signal.
* gdb.reverse/sigall-reverse.exp (signals): New list.
<top level>: Loop over signals in the $signals list instead of
calling a test function once per signal.
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