[clang] [analyzer] Fix crash in RegionStoreManager::bindArray (PR #210200)

[Andy Ames via cfe-commits]

andyames-a11y wrote:

I will progressively add earlier and earlier `clang_analyzer_dump` calls in the production code that is crashing `clang --analyze`, so we trace it back further rather than stop at "a derived symbol."

https://github.com/llvm/llvm-project/pull/210200