[clang] Suppress "follow-up" diagnostics on recovery call expressions.

Because of typo-correction, the AST can be transformed, and the transformed
AST is marginally useful for diagnostics purpose, the following
diagnostics usually do harm than good (easily cause confusions).

Given the following code:

```
void abcc();
void test() {
  if (abc());
  // diagnostic 1 (for the typo-correction): the typo is correct to `abcc()`, so the code is treate as `if (abcc())` in AST perspective;
  // diagnostic 2 (for mismatch type): we perform an type-analysis on `if`, discover the type is not match
}
```

The secondary diagnostic "convertable to bool" is likely bogus to users.

The idea is to use RecoveryExpr (clang's dependent mechanism) to preserve the
recovery behavior but suppress all follow-up diagnostics.

Differential Revision: https://reviews.llvm.org/D89946