gdb/

gdb/
	* dwarf2read.c (check_physname): New variable.
	(dwarf2_physname): Prefer DW_AT_linkage_name over dwarf2_compute_name.
	(show_check_physname): New function.
	(_initialize_dwarf2_read): Add `check-physname' for check_physname.

gdb/doc/
	* gdb.texinfo (Debugging Output): Document set debug
	check-physname.

gdb/testsuite/
	* gdb.base/break-interp.exp (reach_1, test_ld): Allow also the prefix
	__GI_.
	* gdb.cp/psymtab-parameter.cc (func): Make it a template function.
	(f): New function.
	* gdb.cp/psymtab-parameter.exp (complete break 'func(): Rename to ...
	(complete p 'func<short>(): ... here.
	* gdb.dwarf2/dw2-linkage-name-trust-main.cc: New file.
	* gdb.dwarf2/dw2-linkage-name-trust.S: New file.
	* gdb.dwarf2/dw2-linkage-name-trust.exp: New file.
	* gdb.cp/temargs.exp (test type of F in k3_m, test value of F in k3_m):
	Make them KFAIL gcc/49546.