gdb/

gdb/
	Protect entry values against self tail calls.
	* dwarf2loc.c (VEC (CORE_ADDR), func_verify_no_selftailcall): New.
	(dwarf_expr_dwarf_reg_entry_value): Call func_verify_no_selftailcall.

gdb/testsuite/
	Protect entry values against self tail calls.
	* gdb.arch/amd64-entry-value.cc (self2, self): New.
	(main): Call self.
	* gdb.arch/amd64-entry-value.exp (self: breakhere, self: bt)
	(set debug entry-values 1, self: bt debug entry-values): New tests.