[clang] [Clang] Fix dependent local class instantiation bugs (PR #134038)

[Daniel Thornburgh via cfe-commits]

mysterymath wrote:

Here's a link to a reproducer tar; I was able to verify that this reproduces locally using our toolchain prebuilt from CI:

https://storage.googleapis.com/fuchsia-artifacts/builds/8717549930672410881/build-debug/clang-crashreports/map_setting_store-0b592c.tar

https://github.com/llvm/llvm-project/pull/134038