Remove obsolete enforce-via-yul logic and CI run.

test/libsolidity/semanticTests/abiEncoderV1/bool_out_of_bounds.sol

@@ -4,6 +4,7 @@ contract C {
 }
 // ====
 // ABIEncoderV1Only: true
+// compileViaYul: false
 // ----
 // f(bool): true -> true
 // f(bool): false -> false

test/libsolidity/semanticTests/abiEncoderV1/cleanup/cleanup.sol

@@ -7,6 +7,7 @@ contract C {
 }
 // ====
 // ABIEncoderV1Only: true
+// compileViaYul: false
 // ----
 // f(uint16,int16,address,bytes3,bool): 1, 2, 3, "a", true -> 1, 2, 3, "a", true
 // f(uint16,int16,address,bytes3,bool): 0xffffff, 0x1ffff, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff, "abcd", 1 -> 0xffff, 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff, 0xffffffffffffffffffffffffffffffffffffffff, "abc", true

test/libsolidity/semanticTests/abiEncoderV1/enums.sol

@@ -7,6 +7,7 @@ contract C {
 }
 // ====
 // ABIEncoderV1Only: true
+// compileViaYul: false
 // ----
 // f(uint8): 0 -> 0
 // f(uint8): 1 -> 1