[llvm] [SPIR-V] Fix 64-bit integer literal printing (PR #66686)

[Natalie Chouinard via llvm-commits]

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@@ -169,7 +169,9 @@ void SPIRVInstPrinter::printInst(const MCInst *MI, uint64_t Address,
         }
         case SPIRV::OpConstantI:
         case SPIRV::OpConstantF:
-          printOpConstantVarOps(MI, NumFixedOps, OS);
+          // The last fixed operand along with any variadic operands that follow
+          // are part of the variable value.
+          printOpConstantVarOps(MI, NumFixedOps - 1, OS);
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sudonatalie wrote:

That was my original approach in https://reviews.llvm.org/D159376, but I ultimately decided it wasn't as appropriate. While it's not strictly required, keeping the operands one-word each more accurately represents the SPIR-V code (which I think is the intention at that stage of lowering) and there is logic in the serialized binary printer that depends on that assumption.

https://github.com/llvm/llvm-project/pull/66686