AssertionError: Cannot add metadata to an intersection type

javac crashes on the program, which contains a type annotation on a local variable with an inferred intersection type.

```
import java.lang.annotation.ElementType;
import java.lang.annotation.Target;

@Target({ElementType.TYPE_USE, ElementType.LOCAL_VARIABLE})
@interface A {}

class T {

  void t() {
    @A var c = g(1, 1L);
  }

  <X> X g(X a, X b) {
    return a;
  }
}
```

```
javac -fullversion T.java
javac full version "16-ea+34-2216"
...
java.lang.AssertionError: Cannot add metadata to an intersection type
        at jdk.compiler/com.sun.tools.javac.code.Type$IntersectionClassType.cloneWithMetadata(Type.java:1257)
        at jdk.compiler/com.sun.tools.javac.code.Type$IntersectionClassType.cloneWithMetadata(Type.java:1239)
        at jdk.compiler/com.sun.tools.javac.code.Type.annotatedType(Type.java:402)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions$1.visitClassType(TypeAnnotations.java:626)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions$1.visitClassType(TypeAnnotations.java:620)
        at jdk.compiler/com.sun.tools.javac.code.Type$ClassType.accept(Type.java:1010)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions.typeWithAnnotations(TypeAnnotations.java:702)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions.typeWithAnnotations(TypeAnnotations.java:537)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions.separateAnnotationsKinds(TypeAnnotations.java:358)
        at jdk.compiler/com.sun.tools.javac.code.TypeAnnotations$TypeAnnotationPositions.visitVarDef(TypeAnnotations.java:1266)
```