[Committed] Fix -fdump-tree-all-all to be a little more useful

[Andrew Pinski]

The problem here is that -all turns on all the TDF* codes which means that TDF_CHAIN
was being turned on.  Turning on TDF_CHAIN caused all the decl's TREE_CHAIN's to be
walk so the information outputted was useless.  Anyways this patch fixes the problem
by changing debug_tree_chain to walk the tree chain instead of dump_decl_name walking
the decl's tree chain.  I was going to change the name of debug_tree_chain to
debug_decl_chain but was asked by Diego not to.

I Committed this patch after an ok offline by Diego a while back and recent
bootstrap on x86_64-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

	* tree-pretty-print.c (debug_tree_chain): Walk the chains.
	(dump_decl_name): Do not walk the decl tree chains.
	* tree-pass.h (TDF_CHAIN): Remove.


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