[clang] [flang] [mlir] [flang] Add support for -mrecip[=] (PR #143418)

[Cameron McInally via cfe-commits]

================
@@ -2636,6 +2636,11 @@ void 
ModuleImport::processFunctionAttributes(llvm::Function *func,
     funcOp.setTargetFeaturesAttr(
         LLVM::TargetFeaturesAttr::get(context, attr.getValueAsString()));
 
+  if (llvm::Attribute attr = func->getFnAttribute("reciprocal-estimates");
+      attr.isStringAttribute())
----------------
mcinally wrote:

The other examples follow this same pattern. Do you feel strongly that they 
should change?

```
  if (llvm::Attribute attr = func->getFnAttribute("tune-cpu");
      attr.isStringAttribute())
    funcOp.setTuneCpuAttr(StringAttr::get(context, attr.getValueAsString()));

  if (llvm::Attribute attr = func->getFnAttribute("target-features");
      attr.isStringAttribute())
    funcOp.setTargetFeaturesAttr(
        LLVM::TargetFeaturesAttr::get(context, attr.getValueAsString()));

  if (llvm::Attribute attr = func->getFnAttribute("reciprocal-estimates");
      attr.isStringAttribute())
    funcOp.setReciprocalEstimatesAttr(
        StringAttr::get(context, attr.getValueAsString()));
```

https://github.com/llvm/llvm-project/pull/143418
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