[llvm] [NVPTX] support immediate values in st.param instructions (PR #91523)

[Artem Belevich via llvm-commits]

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@@ -2182,6 +2182,84 @@ bool NVPTXDAGToDAGISel::tryStoreRetval(SDNode *N) {
   return true;
 }
 
+// Helpers for constructing opcode (ex: NVPTX::StoreParamV4F32_iiri)
+#define getOpcV2H(ty, op0, op1) NVPTX::StoreParamV2##ty##_##op0##op1
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Artem-B wrote:

The argument naming structure is a bit confusing. 
In some places like here `opN` are  `i` and `r` tokens to be glued together. 
In others `opN` are apparently values that are used in comparisons.

Perhaps give them distinct names (opKindN/isImmN ?)

https://github.com/llvm/llvm-project/pull/91523