[debug-early] remove deferred_asm_name

[Aldy Hernandez <aldyh at redhat dot com>]

As discussed in previous threads, we need to get rid of 
deferred_asm_name (and limbo nodes, etc) as part of the debug-early work.

The original patch for deferred_asm_name came in Alex's patch here:

https://gcc.gnu.org/ml/gcc-patches/2009-06/msg00030.html

One alternative to avoid this mechanism would be to to provide a non 
destructive decl_assembler_name() variant that would just return the 
mangled name, but without setting the .assembler_name field and 
triggering the template instantiation Alex speaks of.  I had a patch for 
this, but Jason was skeptical that the instantiation was still 
happening.  At Jason's request, I have removed deferred_asm_name 
altogether, and tested it by a full bootstrap on _mainline_.

Unless someone can come up with a testcase for the instantiation 
problem, I am going to commit this to the branch within a day or two.

Jason/Richi: Does this patch look reasonable?

Thanks.
Aldy

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