Remove EWASM backend.

test/libsolidity/semanticTests/array/delete/delete_bytes_array.sol

@@ -29,7 +29,6 @@ contract C {
         assert(size == 0);
     }
 }
-
 // ----
 // f() -> 0
 // g() -> 0

test/libsolidity/semanticTests/array/delete/delete_memory_array.sol

@@ -10,6 +10,5 @@ contract C {
         }
     }
 }
-
 // ----
 // len() -> 0

test/libsolidity/semanticTests/array/delete/delete_on_array_of_structs.sol

@@ -15,6 +15,5 @@ contract C {
         return true;
     }
 }
-
 // ----
 // f() -> true # This code interprets x as an array length and thus will go out of gas. neither of the two should throw due to out-of-bounds access #

test/libsolidity/semanticTests/array/delete/delete_storage_array.sol

@@ -32,7 +32,6 @@ contract C {
         }
     }
 }
-
 // ----
 // len() -> 0
 // val() -> 0