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

[Tarun Prabhu 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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tarunprabhu wrote:

I think it is better to stay in the style of the other initializations.

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