Tentatively use proposed OpUnknown syntax

Author: cassiebeckley

llvm/lib/Target/SPIRV/MCTargetDesc/SPIRVInstPrinter.cpp

@@ -327,9 +327,8 @@ void SPIRVInstPrinter::printUnknownType(const MCInst *MI, raw_ostream &O) {
   // Encode the instruction enumerant and word count into the opcode
   const auto OpCode = (0xFF & NumOps) << 16 | (0xFF & Enumerant);
 
-  // Print the opcode using the spirv-as arbitrary integer syntax
-  // https://github.com/KhronosGroup/SPIRV-Tools/blob/main/docs/syntax.md#arbitrary-integers
-  O << "!0x" << Twine::utohexstr(OpCode) << " ";
+  // Print the opcode using the spirv-as unknown opcode syntax
+  O << "OpUnknown(" << Enumerant << ", " << NumOps << ") ";
 
   // The result ID must be printed after the opcode when using this syntax
   printOperand(MI, 0, O);

llvm/test/CodeGen/SPIRV/inline/type.ll

@@ -13,12 +13,12 @@
 ; CHECK: [[uint32_4:%[0-9]+]] = OpConstant [[uint32_t]] 4
 %integral_constant_4 = type target("spirv.IntegralConstant", i32, 4)
 
-; CHECK: !0x4001c [[array_t:%[0-9]+]] [[image_t]] [[uint32_4]]
+; CHECK: OpUnknown(28, 4) [[array_t:%[0-9]+]] [[image_t]] [[uint32_4]]
 %ArrayTex2D = type target("spirv.Type", %type_2d_image, %integral_constant_4, 28, 0, 0)
 
 ; CHECK: [[getTexArray_t:%[0-9]+]] = OpTypeFunction [[array_t]]
 
-; CHECK: !0x40015 [[int_t:%[0-9]+]] 32 1
+; CHECK: OpUnknown(21, 4) [[int_t:%[0-9]+]] 32 1
 %int_t = type target("spirv.Type", %literal_32, %literal_true, 21, 0, 0)
 
 ; CHECK: [[getInt_t:%[0-9]+]] = OpTypeFunction [[int_t]]