c++: Fix mangling of lambas in static member template initializers [PR107741]

c++: Fix mangling of lambas in static member template initializers [PR107741]

My fix for this issue in r15-7147 turns out to not be quite sufficient;
static member templates apparently go down a different code path and
need their own handling.

	PR c++/107741

gcc/cp/ChangeLog:

	* cp-tree.h (is_static_data_member_initialized_in_class):
	Declare new predicate.
	* decl2.cc (start_initialized_static_member): Push the
	TEMPLATE_DECL when appropriate.
	(is_static_data_member_initialized_in_class): New predicate.
	(finish_initialized_static_member): Use it.
	* lambda.cc (record_lambda_scope): Likewise.
	* parser.cc (cp_parser_init_declarator): Start the member decl
	early for static members so that lambda scope is set.
	(cp_parser_template_declaration_after_parameters): Don't
	register in-class initialized static members here.

gcc/testsuite/ChangeLog:

	* g++.dg/abi/lambda-ctx2-19.C: Add tests for template members.
	* g++.dg/abi/lambda-ctx2-19vs20.C: Likewise.
	* g++.dg/abi/lambda-ctx2-20.C: Likewise.
	* g++.dg/abi/lambda-ctx2.h: Likewise.
	* g++.dg/cpp0x/static-member-init-1.C: Likewise.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Jason Merrill <jason@redhat.com>