Implement checked mod for sol->yul code generation.

test/libsolidity/semanticTests/viaYul/detect_mod_zero.sol

@@ -0,0 +1,25 @@
+contract C {
+    function f(uint a, uint b) public pure returns (uint x) {
+        x = a % b;
+    }
+    function g(uint8 a, uint8 b) public pure returns (uint8 x) {
+        x = a % b;
+    }
+}
+// ====
+// compileViaYul: only
+// ----
+// f(uint256,uint256): 10, 3 -> 1
+// f(uint256,uint256): 10, 2 -> 0
+// f(uint256,uint256): 11, 2 -> 1
+// f(uint256,uint256): 2, 2 -> 0
+// f(uint256,uint256): 1, 0 -> FAILURE
+// f(uint256,uint256): 0, 0 -> FAILURE
+// f(uint256,uint256): 0, 1 -> 0
+// g(uint8,uint8): 10, 3 -> 1
+// g(uint8,uint8): 10, 2 -> 0
+// g(uint8,uint8): 11, 2 -> 1
+// g(uint8,uint8): 2, 2 -> 0
+// g(uint8,uint8): 1, 0 -> FAILURE
+// g(uint8,uint8): 0, 0 -> FAILURE
+// g(uint8,uint8): 0, 1 -> 0

test/libsolidity/semanticTests/viaYul/detect_mod_zero_signed.sol

@@ -0,0 +1,35 @@
+contract C {
+    function f(int a, int b) public pure returns (int x) {
+        x = a % b;
+    }
+    function g(int8 a, int8 b) public pure returns (int8 x) {
+        x = a % b;
+    }
+}
+// ====
+// compileViaYul: only
+// ----
+// f(int256,int256): 10, 3 -> 1
+// f(int256,int256): 10, 2 -> 0
+// f(int256,int256): 11, 2 -> 1
+// f(int256,int256): -10, 3 -> -1
+// f(int256,int256): 10, -3 -> 1
+// f(int256,int256): -10, -3 -> -1
+// f(int256,int256): 2, 2 -> 0
+// f(int256,int256): 1, 0 -> FAILURE
+// f(int256,int256): -1, 0 -> FAILURE
+// f(int256,int256): 0, 0 -> FAILURE
+// f(int256,int256): 0, 1 -> 0
+// f(int256,int256): 0, -1 -> 0
+// g(int8,int8): 10, 3 -> 1
+// g(int8,int8): 10, 2 -> 0
+// g(int8,int8): 11, 2 -> 1
+// g(int8,int8): -10, 3 -> -1
+// g(int8,int8): 10, -3 -> 1
+// g(int8,int8): -10, -3 -> -1
+// g(int8,int8): 2, 2 -> 0
+// g(int8,int8): 1, 0 -> FAILURE
+// g(int8,int8): -1, 0 -> FAILURE
+// g(int8,int8): 0, 0 -> FAILURE
+// g(int8,int8): 0, 1 -> 0
+// g(int8,int8): 0, -1 -> 0