Extract error formatting in a different method for host inlining

* 1188 -> 971 for org.truffleruby.language.SpecialVariablesSendingNode.getSpecialVariablesIfRequired

Author: eregon

src/main/java/org/truffleruby/core/kernel/TruffleKernelNodes.java

@@ -240,18 +240,7 @@ protected SpecialVariableStorage getFromKnownFrameDescriptor(Frame frame,
 
                 if (storageFrame == null) {
                     CompilerDirectives.transferToInterpreterAndInvalidate();
-                    int depth = 0;
-                    MaterializedFrame currentFrame = RubyArguments.getDeclarationFrame(frame);
-                    while (currentFrame != null) {
-                        depth += 1;
-                        currentFrame = RubyArguments.getDeclarationFrame(currentFrame);
-                    }
-
-                    String message = String.format(
-                            "Expected %d declaration frames but only found %d frames.",
-                            declarationFrameDepth,
-                            depth);
-                    throw CompilerDirectives.shouldNotReachHere(message);
+                    noStorageFrameError(frame, declarationFrameDepth);
                 }
 
                 variables = SpecialVariableStorage.get(storageFrame);
@@ -282,6 +271,21 @@ public static SpecialVariableStorage getSlow(MaterializedFrame aFrame) {
             return (SpecialVariableStorage) variables;
         }
 
+        private static void noStorageFrameError(Frame frame, int declarationFrameDepth) {
+            int depth = 0;
+            MaterializedFrame currentFrame = RubyArguments.getDeclarationFrame(frame);
+            while (currentFrame != null) {
+                depth += 1;
+                currentFrame = RubyArguments.getDeclarationFrame(currentFrame);
+            }
+
+            String message = String.format(
+                    "Expected %d declaration frames but only found %d frames.",
+                    declarationFrameDepth,
+                    depth);
+            throw CompilerDirectives.shouldNotReachHere(message);
+        }
+
     }
 
     @Primitive(name = "caller_special_variables")