[PATCH] backport of SYMBOL_LANGUAGE assertion failure on AIX PR gdb/23999

[Sangamesh Mallayya]

Hi,

This is a backport of SYMBOL_LANGUAGE assertion failure on AIX patch to 
8.2 branch.
https://sourceware.org/bugzilla/show_bug.cgi?id=23999

Changes were cherry-picked from the master
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=patch;h=b971899198607b844f5a37e39dc561766c3b331a

Thanks,
Sangamesh