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

[Fangrui Song via cfe-commits]

================
@@ -1243,13 +1268,14 @@ Compilation *Driver::BuildCompilation(ArrayRef<const 
char *> ArgList) {
   // Try parsing configuration file.
   if (!ContainsError)
     ContainsError = loadConfigFiles();
-  bool HasConfigFile = !ContainsError && (CfgOptions.get() != nullptr);
+  bool HasConfigFileHead = !ContainsError && CfgOptionsHead;
+  bool HasConfigFileTail = !ContainsError && CfgOptionsTail;
 
   // All arguments, from both config file and command line.
-  InputArgList Args = std::move(HasConfigFile ? std::move(*CfgOptions)
-                                              : std::move(*CLOptions));
+  InputArgList Args = std::move(HasConfigFileHead ? std::move(*CfgOptionsHead)
----------------
MaskRay wrote:

the outer `std::move` is unneeded

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