[llvm] Add support for DFP IR type. (PR #69718)

[Andy Kaylor via llvm-commits]

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@@ -541,11 +541,26 @@ class IRBuilderBase {
     return Type::getFloatTy(Context);
   }
 
+  /// Fetch the type representing a 32-bit decimal floating point value.
+  Type *getDecimal32Ty() {
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andykaylor wrote:

[nit] I'd put this with the others.

https://github.com/llvm/llvm-project/pull/69718