Moving some tests to semantic tests.

test/libsolidity/semanticTests/integer/many_local_variables.sol

@@ -0,0 +1,11 @@
+contract test {
+    function run(uint x1, uint x2, uint x3) public returns(uint y) {
+        uint8 a = 0x1; uint8 b = 0x10; uint16 c = 0x100;
+        y = a + b + c + x1 + x2 + x3;
+        y += b + x2;
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// run(uint256,uint256,uint256): 0x1000, 0x10000, 0x100000 -> 0x121121

test/libsolidity/semanticTests/integer/small_signed_types.sol

@@ -0,0 +1,9 @@
+contract test {
+    function run() public returns(int256 y) {
+        return -int32(10) * -int64(20);
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// run() -> 200