Extracting some Solidity end-to-end tests.

test/libsolidity/semanticTests/expressions/conditional_expression_multiple.sol

@@ -0,0 +1,13 @@
+contract test {
+    function f(uint x) public returns(uint d) {
+        return x > 100 ?
+                    x > 1000 ? 1000 : 100
+                    :
+                    x > 50 ? 50 : 10;
+    }
+}
+// ----
+// f(uint256): 1001 -> 1000
+// f(uint256): 500 -> 100
+// f(uint256): 80 -> 50
+// f(uint256): 40 -> 10