[clang] [Clang][Driver] Fix the missing Target-Triple-Level include path resolution in Baremetal Driver (PR #165321)

[Petr Hosek via cfe-commits]

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@@ -419,6 +421,12 @@ void BareMetal::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
       llvm::sys::path::append(Dir, "include");
       addSystemInclude(DriverArgs, CC1Args, Dir.str());
     }
+    SmallString<128> Dir = SysRootDir;
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petrhosek wrote:

Nit: I'd use copy constructor over assignment operator for consistency with the existing code.
```suggestion
    SmallString<128> Dir(SysRootDir);
```

https://github.com/llvm/llvm-project/pull/165321