re PR other/78252 (C++ demangler crashes with infinite recursion with lambda (auto))

re PR other/78252 (C++ demangler crashes with infinite recursion with lambda (auto))

	libiberty/
	PR c++/78252
	* cp-demangle.c (struct d_print_info): Add is_lambda_arg field.
	(d_print_init): Initialize it.
	(d_print_comp_inner) <DEMANGLE_COMPONENT_TEMPLATE_PARAM>: Check
	is_lambda_arg for auto.
	<DEMANGLE_COMPONENT_REFERENCE,
	DEMANGLE_COMPONENT_RVALUE_REFERENCE>: Skip smashing check when
	is_lambda_arg.
	<DEMANGLE_COMPONENT_LAMBDA>: Increment is_lambda_arg around arg
	printing.
	* testsuite/demangle-expected: Add lambda auto mangling cases.

	gcc/testsuite/
	PR c++/78252
	* g++.dg/cpp1y/lambda-mangle-1.C: New.

From-SVN: r243566