[clang] [clang-repl] Handle frontend options for clang-repl before calling executeAction (PR #132670)

[Anutosh Bhat via cfe-commits]

anutosh491 wrote:

After handling these args we should see 
```
(base) anutosh491 at Anutoshs-MacBook-Air bin % ./clang-repl --Xcc -Xclang --Xcc -version                                      
LLVM (http://llvm.org/):
  LLVM version 21.0.0git
  Optimized build.
clang-repl: Version displayed
```
rather than the abort.

https://github.com/llvm/llvm-project/pull/132670