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[patch] PR debug/46102 Disable -feliminate-dwarf2-dups when reading a PCH

[And this time, actually CCing the list :)].


Reading in the compiler state for pch (gt_pch_restore) obliterates the
DIE table, and consequently the DW_TAG_GNU_[BE]INCL* DIEs that may have
been in it.  This causes inconsistencies when reading in _any_
pre-compiled header into a source file that uses
-feliminate-dwarf2-dups, and consequently already has some

Normally the DIE table should be empty this early on, especially since
mainline generates dwarf at the end of the compilation unit, but the DIE
table may have DW_TAG_GNU_[BE]INCL* DIEs that were created early by
dwarf2out_start_source_file/etc or it may have the DW_TAG_compile_unit.

I suppose we could merge incoming DIEs with existing DIEs and complicate
our lives, but considering we will probably have to tackle this in the
debug-early work, I propose we disable this combination for now (and
possibly permanently, unless we really care about it).

OK for mainline pending tests?


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