[clang] [flang] [mlir] [flang] Add support for -mprefer-vector-width=<value> (PR #141380)

[Cameron McInally via cfe-commits]

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@@ -126,6 +127,8 @@ struct MLIRToLLVMPassPipelineConfig : public FlangEPCallBacks {
   bool NoSignedZerosFPMath =
       false; ///< Set no-signed-zeros-fp-math attribute for functions.
   bool UnsafeFPMath = false; ///< Set unsafe-fp-math attribute for functions.
+  std::string PreferVectorWidth = ""; ///< Set prefer-vector-width attribute for
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mcinally wrote:

If there are no objections, I'll leave this. The other std::string's in the function are initialized the same way, so probably best to stay in that style.

https://github.com/llvm/llvm-project/pull/141380