Merge pull request #10554 from ethereum/emptyBytesPushSol2Yul

[Sol->Yul] Implementing empty byte array push.

test/libsolidity/semanticTests/array/copying/empty_bytes_copy.sol

@@ -22,6 +22,8 @@ contract C {
         return data[0];
     }
 }
+// ====
+// compileViaYul: also
 // ----
 // fromMemory() -> 0x00
 // fromCalldata(bytes): 0x40, 0x60, 0x00, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff -> 0x00

test/libsolidity/semanticTests/array/push/push_no_args_bytes.sol

@@ -18,6 +18,8 @@ contract C {
 		return array[index];
 	}
 }
+// ====
+// compileViaYul: also
 // ----
 // l() -> 0
 // g(uint256): 70 ->