Merge pull request #10529 from blishko/compound_assignment

[SMTChecker] Remove assert that is not true for compound assignment with right shift

test/libsolidity/smtCheckerTests/operators/compound_assignment_right_shift.sol

@@ -0,0 +1,11 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f(int a, uint b) public view {
+		a >>= tx.gasprice;
+		require(a == 16 && b == 2);
+		a >>= b;
+		assert(a == 4); // should hold
+	}
+}
+// ----