spirv-fuzz: Fix to operand id type (#3937)

Fixes #3934.

source/fuzz/transformation_replace_branch_from_dead_block_with_exit.cpp

@@ -117,7 +117,7 @@ void TransformationReplaceBranchFromDeadBlockWithExit::Apply(
   opt::Instruction::OperandList new_terminator_in_operands;
   if (message_.opcode() == SpvOpReturnValue) {
     new_terminator_in_operands.push_back(
-        {SPV_OPERAND_TYPE_TYPE_ID, {message_.return_value_id()}});
+        {SPV_OPERAND_TYPE_ID, {message_.return_value_id()}});
   }
   auto terminator = block->terminator();
   terminator->SetOpcode(static_cast<SpvOp>(message_.opcode()));

test/fuzz/transformation_replace_branch_from_dead_block_with_exit_test.cpp

@@ -337,6 +337,12 @@ TEST(TransformationReplaceBranchFromDeadBlockWithExitTest,
   ASSERT_TRUE(fuzzerutil::IsValidAndWellFormed(context.get(), validator_options,
                                                kConsoleMessageConsumer));
 
+  opt::Instruction* return_value_inst =
+      context->get_instr_block(201)->terminator();
+  ASSERT_EQ(SpvOpReturnValue, return_value_inst->opcode());
+  ASSERT_EQ(SPV_OPERAND_TYPE_ID, return_value_inst->GetInOperand(0).type);
+  ASSERT_EQ(400, return_value_inst->GetSingleWordInOperand(0));
+
   std::string after_transformation = R"(
                OpCapability Shader
           %1 = OpExtInstImport "GLSL.std.450"