Comment 1 for bug 1995274

Trying to use Valgrind with a binary compiled by Clang14 with DWARF5 enabled results in Valgrind complaing about possibly corrupted debuginfo and aborting.

Attached are 3 patches that improve the situation. I'm not very familiar with Valgrind internals or DWARF, but with these patches Valgrind is now able to run Clang14-compiled programs without complaining and generally seems to work. The one thing I've noticed that still does not work is backtraces with split-dwarf, they report the binary name instead of source file location, I don't know if the 3rd patch is incorrect in the assumption that rnglistx/loclistx may be ignored, or if it's something else missing.