Handle scoping in CodeView LF_FUNC_ID types

If a function is in a namespace, create an LF_STRING_ID type for the
name of its parent, and record this in the LF_FUNC_ID type we create
for the function.

gcc/
	* dwarf2codeview.cc (enum cf_leaf_type): Add LF_STRING_ID.
	(struct codeview_custom_type): Add lf_string_id to union.
	(struct string_id_hasher): New type.
	(string_id_htab): New global variable.
	(write_lf_string_id): New function.
	(write_custom_types): Call write_lf_string_id.
	(codeview_debug_finish): Free string_id_htab.
	(add_string_id): New function.
	(get_scope_string_id): New function.
	(add_function): Call get_scope_string_id and set scope.

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