Updated the DivisionByZeroError to not use assembly

contracts/exchange-libs/contracts/src/MixinLibMathRichErrors.sol

@@ -14,11 +14,7 @@ contract MixinLibMathRichErrors is
         pure
         returns (bytes memory)
     {
-        bytes4 divisionError = DIVISION_BY_ZERO_SELECTOR;
-        assembly {
-            mstore(0, divisionError)
-            revert(0, 4)
-        }
+        return DIVISION_BY_ZERO_ERROR;
     }
 
     function RoundingError(

contracts/exchange-libs/contracts/src/interfaces/IMixinLibMathRichErrors.sol

@@ -4,7 +4,11 @@ pragma solidity ^0.5.9;
 contract IMixinLibMathRichErrors {
 
     // bytes4(keccak256("DivisionByZeroError()"))
-    bytes4 internal constant DIVISION_BY_ZERO_SELECTOR =
+    bytes internal constant DIVISION_BY_ZERO_ERROR =
+        hex"a791837c";
+
+    // bytes4(keccak256("DivisionByZeroError()"))
+    bytes4 internal constant DIVISION_BY_ZERO_ERROR_SELECTOR =
         0xa791837c;
 
     // bytes4(keccak256("RoundingError(uint256,uint256,uint256)"))

contracts/exchange/test/internal.ts

@@ -446,7 +446,7 @@ describe('Exchange core internal functions', () => {
             const totalFilledAmount = takerAssetFilledAmount.plus(orderTakerAssetFilledAmount);
             if (totalFilledAmount.isGreaterThan(MAX_UINT256)) {
                 // FIXME throw safeMathErrorForSendTransaction(takerAssetFilledAmount, orderTakerAssetFilledAmount);
-                throw safeMathErrorForSendTransaction();
+                throw safeMathErrorForSendTransaction;
             }
             return totalFilledAmount;
         }