Fixes and closes #53952. Setting the ASTHasCompilerErrors member variable...

Fixes and closes #53952. Setting the ASTHasCompilerErrors member variable correctly based on the PP diagnostics. (#68127)

The issue #53952 is reported indicating clang is giving a crashing pch
file, when hasErrors is been passed incorrectly to WriteAST method.

To fix the issue, the parameter has been removed and instead we're
relying on the results of `hasUncompilableErrorOccured()` instead of
letting the caller override it.

Fixes https://github.com/llvm/llvm-project/issues/53952