Remove EWASM backend.

test/libsolidity/semanticTests/array/pop/array_pop_empty_exception.sol

@@ -6,7 +6,5 @@ contract c {
         return true;
     }
 }
-// ====
-// compileToEwasm: also
 // ----
 // test() -> FAILURE, hex"4e487b71", 0x31

test/libsolidity/semanticTests/array/pop/array_pop_isolated.sol

@@ -8,7 +8,5 @@ contract c {
         x = 3;
     }
 }
-// ====
-// compileToEwasm: also
 // ----
 // test() -> 3

test/libsolidity/semanticTests/array/pop/byte_array_pop.sol

@@ -12,7 +12,5 @@ contract c {
         l = data.length;
     }
 }
-// ====
-// compileToEwasm: also
 // ----
 // test() -> 2, 1, 1

test/libsolidity/semanticTests/array/pop/byte_array_pop_copy_long.sol

@@ -7,7 +7,6 @@ contract c {
         return data;
     }
 }
-
 // ----
 // test() -> 0x20, 29, 0x0303030303030303030303030303030303030303030303030303030303000000
 // gas irOptimized: 109310

test/libsolidity/semanticTests/array/pop/byte_array_pop_empty_exception.sol

@@ -9,7 +9,5 @@ contract c {
         return true;
     }
 }
-// ====
-// compileToEwasm: also
 // ----
 // test() -> FAILURE, hex"4e487b71", 0x31

test/libsolidity/semanticTests/array/pop/byte_array_pop_isolated.sol

@@ -8,7 +8,5 @@ contract c {
         x = 3;
     }
 }
-// ====
-// compileToEwasm: also
 // ----
 // test() -> 3

test/libsolidity/semanticTests/array/pop/byte_array_pop_masking_long.sol

@@ -7,7 +7,6 @@ contract c {
         return data;
     }
 }
-
 // ----
 // test() -> 0x20, 33, 0x303030303030303030303030303030303030303030303030303030303030303, 0x0300000000000000000000000000000000000000000000000000000000000000
 // gas irOptimized: 108053

test/libsolidity/semanticTests/array/pop/byte_array_pop_storage_empty.sol

@@ -9,8 +9,6 @@ contract c {
         data.pop();
     }
 }
-// ====
-// compileToEwasm: also
 // ----
 // test() ->
 // storageEmpty -> 1