[clang] [Clang][CodeGen] Fix crash on value-dependent initializer during error recovery (PR #181561)

[Giovanni B. via cfe-commits]

Z3rox-dev wrote:

This fix likely also addresses the crash reported in #181062, since #181410 (which this PR fixes) was reduced from that same issue by @Endilll. Both share the same root cause: a value-dependent initializer surviving into CodeGen due to error recovery from an invalid template partial specialization (regressed by #161029).

https://github.com/llvm/llvm-project/pull/181561