This reverts commit 348374028970c956f2e49ab7553b495d7408ccd9 because #128619 doesn't handle the case when we have an empty frame from `getInliningInfoForAddress` because line num is 0 which makes it non-differentiable from missing debug info. So, we end up using the base filename from symtab again. Reverting for now until that issus is solved.

This land commits 23aca2f88dd5d2447e69496c89c3ed42a56f9c31 and
1b15a89a23c631a8e2d096dad4afe456970572c0.
https://github.com/llvm/llvm-project/pull/128619 makes symbolizer to
always use debug info when available so we can reland this chagnge.

The dependency commit was reverted at https://github.com/llvm/llvm-project/commit/23aca2f88dd5d2447e69496c89c3ed42a56f9c31. Reverting this as well.

In #124846 the symbolizer was changed to ignore 0-column entries, which
lead to a slightly different representation in the stack traces. This
patch addresses these differences.

Not sure if the difference in kernel_trap.c is also a result of this
change or not.
Can be tracked separate from this, after the bots are back to green.

It appears that the RUNTIMES build prefers the x86-64-unknown-linux-gnu
triple notation for the host. This fixes runtime / test breakages when
compiler-rt is used as the CLANG_DEFAULT_RTLIB.

The kernel names for OpenMP are manually mangled and not ideal when we
report something to the user. We demangle them now, providing the
function and line number of the target region, together with the actual
kernel name.