Match demangled name in "skip"

Match demangled name in "skip"

PR gdb/26598 notes that, before commit bcfe6157ca28 ("Use the linkage
name if it exists"), the "skip" command would match the demangled name
of a symbol, but now only matches the linkage name.

This patch fixes this regression.  I looked at all calls to
function_name_is_marked_for_skip, and only one used the linkage name.

2020-09-16  Tom Tromey  <tromey@adacore.com>

	PR gdb/26598:
	* infrun.c (fill_in_stop_func): Use find_pc_partial_function_sym.

gdb/testsuite/ChangeLog
2020-09-16  Tom Tromey  <tromey@adacore.com>

	PR gdb/26598:
	* gdb.base/skipcxx.exp: New file.
	* gdb.base/skipcxx.cc: New file.