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

[Zahira Ammarguellat via llvm-commits]

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@@ -3672,6 +3678,9 @@ Floating-Point Types
    * - ``ppc_fp128``
      - 128-bit floating-point value (two 64-bits)
 
+   * - ``decimal128``
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zahiraam wrote:

The others were separated. I have put them altogether at the end. Is this OK?

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