Remove case using reverted function

Author: mikolaj-pirog

llvm-spirv/lib/SPIRV/SPIRVWriter.cpp

@@ -6840,10 +6840,6 @@ LLVMToSPIRVBase::transBuiltinToInstWithoutDecoration(Op OC, CallInst *CI,
                                       transValue(CI->getArgOperand(2), BB), BB);
     return BM->addStoreInst(transValue(CI->getArgOperand(0), BB), V, {}, BB);
   }
-  case OpCooperativeMatrixLengthKHR: {
-    return BM->addCooperativeMatrixLengthKHRInst(
-        transScavengedType(CI), transType(CI->getArgOperand(0)->getType()), BB);
-  }
   case OpGroupNonUniformShuffle:
   case OpGroupNonUniformShuffleDown:
   case OpGroupNonUniformShuffleUp: