[clang] [llvm] target ABI: improve call parameters extensions handling (PR #100757)

[Jonas Paulsson via cfe-commits]

JonPsson1 wrote:

Patch rebased. Tests failing as before:

```
Failed Tests (44):
  Clang :: CodeGenObjC                              1 fail
  Clang :: Interpreter                             15 fails
  Clang-Unit :: Interpreter                        18 fails
  LLVM-Unit :: ExecutionEngine/Orc/./OrcJITTests    5 fails
```
(still waiting for suggestions as to how to handle these failures: like llc (disabling) or do they need actual fixing?)


https://github.com/llvm/llvm-project/pull/100757