[analyzer] Fix stores through label locations (#89265)

Interestingly, this case crashed from the very beginning of the project,
at least starting by clang-3.

As a "fix" I just do the same thing as we do for concrete integers. It
might not be the best we could do, but arguably, it's still better than
crashing.

Fixes #89185

GitOrigin-RevId: 7d8616ed500f01b201667020c9be545d686950be
3 files changed