gccgo: Added code to dump the AST tree. The AST dump is

gccgo:	Added code to dump the AST tree. The AST dump is
	activated with -fgo-dump-ast.
	Initial version, it only dumps (most) constructs that
	are expected after the lowering transformation.

	* Make-lang.in (GO_OBJS): Add go/ast-dump.o.
	(go/ast-dump.o): New target.
	(go/expressions.o): Depend on go/gofrontend/ast-dump.h.
	(go/statements.o): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@177225 138bc75d-0d04-0410-961f-82ee72b054a4