Merge pull request #7421 from ethereum/develop

Merge develop into develop_060

test/libsolidity/semanticTests/smoke/fallback.sol

@@ -0,0 +1,23 @@
+contract A {
+    uint public data;
+    uint public balance;
+    bytes public externalData;
+    function() external payable {
+        data += 1;
+        balance = msg.value;
+        externalData = msg.data;
+    }
+}
+// ----
+// data() -> 0
+// ()
+// data() -> 1
+// (): hex"42ef"
+// data() -> 2
+// externalData() -> 0x20, 2, left(0x42ef)
+// balance() -> 0
+// (), 1 ether
+// balance() -> 1
+// (), 2 ether: hex"fefe"
+// balance() -> 2
+// externalData() -> 0x20, 2, left(0xfefe)