[PATCH] Introduce global DECL_UID -> tree mapping (with pch fixed)

[Richard Guenther]

On Tue, 26 Feb 2008, Richard Guenther wrote:

> 
> This is the mapping introduction patch with a fix for the bootstrap
> problems that happened in the "right" ggc circumstances.  The problem
> is that the C++ FE ggc_frees decls, so the memory can be re-used while
> the global mapping still points to that memory.  Fixed by removing the
> decl from the mapping before ggc_freeing it.
> 
> I bootstrapped and tested this on x86_64-unknown-linux-gnu with release
> checking enabled (this triggered the failure before), and I'll now
> re-test the combined patch that makes referenced_vars a bitmap.
> 
> I suppose the cp/ change is obvious, so I'll apply the patch again after
> that extra testing finished.

Thus, re-applied as rev. 132676.

Richard.