PATCH to dwarf2out.c for c++/22489

[Jason Merrill]

Mark's change to lazily declare synthesized methods broke dwarf2 output 
because we expect the declaration DIE to be generated when we generate 
the DIE for the class, but if we don't create the decl until later that 
doesn't happen.  This patch fixes that by adding the declaration die to 
the class when we want to point to it.

I also fixed a bug in force_type/decl_die that caused us to generate 
duplicate DIEs.

Tested x86_64-pc-linux-gnu, applied to trunk and 4.0 branch.
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