Remove a not used Primitive.compiled? method

Author: andrykonchin

src/main/java/org/truffleruby/extra/TruffleGraalNodes.java

@@ -144,14 +144,6 @@ RubyProc copyCapturedLocals(RubyProc proc) {
 
     }
 
-    @Primitive(name = "compiled?")
-    public abstract static class IsCompiledNode extends PrimitiveNode {
-        @Specialization
-        boolean isCompiled() {
-            return CompilerDirectives.inCompiledCode();
-        }
-    }
-
     @Primitive(name = "assert_compilation_constant")
     public abstract static class AssertCompilationConstantNode extends PrimitiveArrayArgumentsNode {