[clang] [X86][clang-cl] Add CL option /vlen (PR #166375)

[Phoebe Wang via cfe-commits]

================
@@ -8266,6 +8266,37 @@ void Clang::AddClangCLArgs(const ArgList &Args, 
types::ID InputType,
                                                      << "/kernel";
  }
 
+  if (Args.hasArg(options::OPT__SLASH_vlen_default)) {
+    // Override /vlen= options.
----------------
phoebewang wrote:

Yes, MSVC also takes precedence of the last flag: 
https://godbolt.org/z/43Ga39WhE

https://github.com/llvm/llvm-project/pull/166375
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