Include revert strings in IR

test/libsolidity/semanticTests/revertStrings/called_contract_has_code.sol

@@ -7,6 +7,7 @@ contract C {
 }
 // ====
 // EVMVersion: >=byzantium
+// compileViaYul: also
 // revertStrings: debug
 // ----
 // g() -> FAILURE, hex"08c379a0", 0x20, 37, "Target contract does not contain", " code"

test/libsolidity/semanticTests/revertStrings/ether_non_payable_function.sol

@@ -4,6 +4,7 @@ contract C {
 // ====
 // EVMVersion: >=byzantium
 // revertStrings: debug
+// compileViaYul: also
 // ----
 // f(), 1 ether -> FAILURE, hex"08c379a0", 0x20, 34, "Ether sent to non-payable functi", "on"
 // () -> FAILURE, hex"08c379a0", 0x20, 53, "Contract does not have fallback ", "nor receive functions"

test/libsolidity/semanticTests/revertStrings/library_non_view_call.sol

@@ -9,6 +9,7 @@ contract C {
     }
 }
 // ====
+// compileViaYul: also
 // EVMVersion: >=byzantium
 // revertStrings: debug
 // ----

test/libsolidity/semanticTests/revertStrings/unknown_sig_no_fallback.sol

@@ -4,5 +4,6 @@ contract A {
 // ====
 // EVMVersion: >=byzantium
 // revertStrings: debug
+// compileViaYul: also
 // ----
 // (): hex"00" -> FAILURE, hex"08c379a0", 0x20, 41, "Unknown signature and no fallbac", "k defined"