Update libcxxrt's private copy of elftoolchain demangler

This updates the private copy of libelftc_dem_gnu3.c in libcxxrt with
the most recent version from upstream r3877. Similar to r367322, this
fixes a number of possible assertions, and allows it to correctly
demangle several names that it could not handle before.

PR:		250702
MFC after:	3 days
This commit is contained in:
Dimitry Andric 2020-11-04 11:13:36 +00:00
parent c2bffd0a97
commit a7941b3326

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