Move implementation details of block args into InlinedBlockGivenNode.

Author: aardvark179

src/main/java/org/truffleruby/core/inlined/CoreMethods.java

@@ -173,10 +173,7 @@ public RubyNode createCallNode(RubyCallNodeParameters callParameters, Translator
                     break;
                 case "block_given?":
                     if (callParameters.isIgnoreVisibility()) {
-                        RubyNode readBlockNode = environment.findLocalVarOrNilNode(TranslatorEnvironment.IMPLICIT_BLOCK_NAME, null);
-                        return InlinedBlockGivenNodeGen.create(context, callParameters,
-                                       readBlockNode,
-                                       self);
+                        return InlinedBlockGivenNodeGen.create(context, callParameters, environment, self);
                     }
                     break;
                 case "nil?":

src/main/java/org/truffleruby/core/inlined/InlinedBlockGivenNode.java

@@ -13,6 +13,7 @@
 import org.truffleruby.language.RubyNode;
 import org.truffleruby.language.dispatch.RubyCallNodeParameters;
 import org.truffleruby.language.methods.LookupMethodNode;
+import org.truffleruby.parser.TranslatorEnvironment;
 
 import com.oracle.truffle.api.dsl.Cached;
 import com.oracle.truffle.api.dsl.Fallback;
@@ -24,9 +25,9 @@ public abstract class InlinedBlockGivenNode extends UnaryInlinedOperationNode {
     protected static final String METHOD = "block_given?";
     @Child protected RubyNode readNode;
 
-    public InlinedBlockGivenNode(RubyContext context, RubyCallNodeParameters callNodeParameters, RubyNode readNode) {
+    public InlinedBlockGivenNode(RubyContext context, RubyCallNodeParameters callNodeParameters,  TranslatorEnvironment environment) {
         super(callNodeParameters);
-        this.readNode = readNode;
+        this.readNode = environment.findLocalVarOrNilNode(TranslatorEnvironment.IMPLICIT_BLOCK_NAME, null);
     }
 
     @Specialization(guards = {