gccrs: ast: builder: Remove ASTTypeBuilder

gccrs: ast: builder: Remove ASTTypeBuilder

gcc/rust/ChangeLog:

	* Make-lang.in: Remove object file for ASTTypeBuilder.
	* ast/rust-ast-builder.h: Remove function.
	* ast/rust-ast-builder.cc (Builder::new_type): Likewise.
	(Builder::new_const_param): Use reconstruct_type() instead.
	(Builder::new_generic_args): Likewise.
	* expand/rust-derive-default.cc (DeriveDefault::visit_struct): Likewise.
	(DeriveDefault::visit_tuple): Likewise.
	* expand/rust-derive-eq.cc (DeriveEq::visit_tuple): Likewise.
	(DeriveEq::visit_struct): Likewise.
	(DeriveEq::visit_enum): Likewise.
	(DeriveEq::visit_union): Likewise.
	* ast/rust-ast-builder-type.cc: Removed.
	* ast/rust-ast-builder-type.h: Removed.