[clang] [flang] [flang][Driver] Support -nodefaultlibs, -nostartfiles and -nostdlib (PR #72601)

[Fangrui Song via cfe-commits]

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@@ -5152,7 +5152,8 @@ def : Flag<["-"], "nocudalib">, Alias<nogpulib>;
 def gpulibc : Flag<["-"], "gpulibc">, Visibility<[ClangOption, CC1Option]>,
   HelpText<"Link the LLVM C Library for GPUs">;
 def nogpulibc : Flag<["-"], "nogpulibc">, Visibility<[ClangOption, CC1Option]>;
-def nodefaultlibs : Flag<["-"], "nodefaultlibs">;
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MaskRay wrote:

I think these options are primarily for ELF where some may apply to Mach-O.

These options likely don't make sense for `dxc.exe` from Windows.

https://github.com/llvm/llvm-project/pull/72601