[clang] [flang] [clang][driver] Special care for -l flags in config files (PR #117573)

[Fangrui Song via cfe-commits]

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@@ -1062,6 +1062,16 @@ bool Driver::readConfigFile(StringRef FileName,
   for (Arg *A : *NewOptions)
     A->claim();
 
+  std::unique_ptr<InputArgList> NewLinkerIns = std::make_unique<InputArgList>();
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MaskRay wrote:

`auto` since RHS makes the type clear.

https://github.com/llvm/llvm-project/pull/117573