[Bug symtab/12707] physname regression: set print demangle off

["tromey at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12707

--- Comment #6 from Tom Tromey <tromey at redhat dot com> ---
I looked into my idea from comment #3 a bit.

It occurred to me that we could hack the demangler a bit to return
both the full demangled name and a pointer to the part just after the
return type.

Then we could enter both of these strings into a hash table mapping
from the demangled forms back to the mangled name.

Symbol lookup would proceed by first looking up a name in this map,
and, if found, using the mangled form as the search key.

This would let us remove the demangled hash entirely from minimal
symbols.

To get the reverse direction to be efficient we could make a second
hash table, mapping the mangled form to a canonical demangled form.


It all seems doable, maybe not even too hard.  And it has some
benefits for users.  However I hesitated to follow through because I
am concerned it might be taking the symbol tables in the wrong
direction.

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