Remove EWASM backend.

test/libsolidity/semanticTests/multiSource/circular_import.sol

@@ -9,7 +9,5 @@ contract C {
     return f() - g();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // foo() -> 1

test/libsolidity/semanticTests/multiSource/circular_import_2.sol

@@ -10,7 +10,5 @@ contract C {
     return h() - f() - g();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // foo() -> 992

test/libsolidity/semanticTests/multiSource/circular_reimport.sol

@@ -12,7 +12,5 @@ contract C {
     return f() - g() - h();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // foo() -> 0x60

test/libsolidity/semanticTests/multiSource/circular_reimport_2.sol

@@ -12,7 +12,5 @@ contract C {
     return 10000 + f() - g() - h();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // foo() -> 0x2324

test/libsolidity/semanticTests/multiSource/free_different_interger_types.sol

@@ -8,7 +8,5 @@ contract C {
     return (g(2), g(false));
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // foo() -> 24, true

test/libsolidity/semanticTests/multiSource/free_function_resolution_base_contract.sol

@@ -12,7 +12,5 @@ contract D is C {
     return g();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // h() -> 1337

test/libsolidity/semanticTests/multiSource/free_function_resolution_override_virtual.sol

@@ -12,7 +12,5 @@ contract D is C {
     return f();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // g() -> 1337

test/libsolidity/semanticTests/multiSource/free_function_resolution_override_virtual_super.sol

@@ -12,7 +12,5 @@ contract D is C {
     return super.g();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // g() -> 1337

test/libsolidity/semanticTests/multiSource/free_function_resolution_override_virtual_transitive.sol

@@ -19,7 +19,5 @@ contract E is D {
     return super.g() + 1;
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // g() -> 1339

test/libsolidity/semanticTests/multiSource/free_function_transitive_import.sol

@@ -20,8 +20,5 @@ contract E is D {
     return f();
   }
 }
-
-// ====
-// compileToEwasm: also
 // ----
 // i() -> 1337

test/libsolidity/semanticTests/multiSource/import.sol

@@ -7,8 +7,6 @@ import "A";
 contract B is A {
 	function f(uint256 x) public view returns(uint256) { return x; }
 }
-// ====
-// compileToEwasm: also
 // ----
 // f(uint256): 1337 -> 1337
 // g(uint256): 1337 -> 1338

test/libsolidity/semanticTests/multiSource/imported_free_function_via_alias.sol

@@ -13,7 +13,5 @@ contract D is M.C {
     return super.g() + f() * 10000;
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // g() -> 61337

test/libsolidity/semanticTests/multiSource/imported_free_function_via_alias_direct_call.sol

@@ -8,7 +8,5 @@ contract D {
     return g() + f() * 10000;
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // h() -> 61337

test/libsolidity/semanticTests/multiSource/reimport_imported_function.sol

@@ -9,7 +9,5 @@ contract C {
     return h();
   }
 }
-// ====
-// compileToEwasm: also
 // ----
 // foo() -> 1337