* gdb.python/py-strfns.exp (test_strfns_core_file): Use
gdb_gcore_cmd.
* gdb.cell/gcore.exp: Use gdb_gcore_cmd.
* gdb.base/gcore.exp: Use gdb_gcore_cmd.
* gdb.base/gcore-relro.exp: Use gdb_gcore_cmd.
* gdb.base/gcore-buffer-overflow.exp: Use gdb_gcore_cmd.
* gdb.base/auxv.exp: Use gdb_gcore_cmd.
* gdb.arch/vsx-regs.exp: Use gdb_gcore_cmd.
* gdb.arch/system-gcore.exp: Use gdb_gcore_cmd.
* gdb.arch/pa-nullify.exp (test_core_bt): Use gdb_gcore_cmd.
* lib/gdb.exp (gdb_gcore_cmd): New proc.
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