[clang] Fix error recovery while PTU cleanup (PR #127467)

[Anutosh Bhat via cfe-commits]

anutosh491 wrote:

For anyone interested in seeing the error at realtime, I am just leaving the static link for xeus-cpp-lite here.

https://compiler-research.org/xeus-cpp/lab/index.html

Possibly trying something like 
```
int x = 5;
auto capture = [&]() { return x * 2; };
```
Should display the assertion error in the console.

https://github.com/llvm/llvm-project/pull/127467