8075263: MHI::checkCustomized isn't eliminated for inlined MethodHandles

Reviewed-by: jrose, kvn

jdk/src/java.base/share/classes/java/lang/invoke/Invokers.java

@@ -394,6 +394,7 @@ class Invokers {
     @ForceInline
     void checkCustomized(Object o) {
         MethodHandle mh = (MethodHandle)o;
+        if (MethodHandleImpl.isCompileConstant(mh)) return;
         if (mh.form.customized == null) {
             maybeCustomize(mh);
         }

jdk/src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java

@@ -722,6 +722,13 @@ import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
         return result;
     }
 
+    // Intrinsified by C2. Returns true if obj is a compile-time constant.
+    @LambdaForm.Hidden
+    static
+    boolean isCompileConstant(Object obj) {
+        return false;
+    }
+
     static
     MethodHandle makeGuardWithTest(MethodHandle test,
                                    MethodHandle target,