Refactor ReadStringNode and ReadStringOrDefaultValueNode to not instantiate not needed object to instantiate ToStringNode

Author: andrykonchin

src/main/java/org/truffleruby/core/format/read/array/ReadStringNode.java

@@ -12,11 +12,9 @@
 import org.truffleruby.core.array.ArrayGuards;
 import org.truffleruby.core.array.library.ArrayStoreLibrary;
 import org.truffleruby.core.format.FormatNode;
-import org.truffleruby.core.format.LiteralFormatNode;
 import org.truffleruby.core.format.convert.ToStringNode;
 import org.truffleruby.core.format.convert.ToStringNodeGen;
 import org.truffleruby.core.format.read.SourceNode;
-import org.truffleruby.core.format.write.bytes.WriteByteNodeGen;
 
 import com.oracle.truffle.api.CompilerDirectives;
 import com.oracle.truffle.api.dsl.ImportStatic;
@@ -68,7 +66,7 @@ private Object readAndConvert(Object value) {
                     conversionMethod,
                     inspectOnConversionFailure,
                     specialClassBehaviour,
-                    WriteByteNodeGen.create(new LiteralFormatNode((byte) 0))));
+                    null));
         }
 
         return toStringNode.executeToString(value);

src/main/java/org/truffleruby/core/format/read/array/ReadStringOrDefaultValueNode.java

@@ -12,11 +12,9 @@
 import org.truffleruby.core.array.ArrayGuards;
 import org.truffleruby.core.array.library.ArrayStoreLibrary;
 import org.truffleruby.core.format.FormatNode;
-import org.truffleruby.core.format.LiteralFormatNode;
 import org.truffleruby.core.format.convert.ToStringOrDefaultValueNode;
 import org.truffleruby.core.format.convert.ToStringOrDefaultValueNodeGen;
 import org.truffleruby.core.format.read.SourceNode;
-import org.truffleruby.core.format.write.bytes.WriteByteNodeGen;
 
 import com.oracle.truffle.api.CompilerDirectives;
 import com.oracle.truffle.api.dsl.ImportStatic;
@@ -73,7 +71,7 @@ private Object readAndConvert(Object value) {
                     inspectOnConversionFailure,
                     valueOnNil,
                     specialClassBehaviour,
-                    WriteByteNodeGen.create(new LiteralFormatNode((byte) 0))));
+                    null));
         }
 
         return toStringOrDefaultValueNode.executeToString(value);