VM should constant fold Unsafe.get*() loads from final fields

VM doesn't constant fold loads from final fields when field MethodHandles are used.

public class FieldAccess {
    static final int s1 = 123;

    static final MethodHandle f1;
    static {
        try {
            Class<?> THIS_CLASS = FieldAccess.class;
            MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
            f1 = LOOKUP.findStaticGetter(THIS_CLASS, "s1", int.class);
        } catch (Exception e) {
            throw new Error(e);
        }
    }

    static int testMH() throws Throwable {
        return (int)f1.invokeExact();
    }
    static int testDirect() throws Throwable {
        return s1;
    }

    public static void main(String[] args) throws Throwable {
        while (true) {
            testDirect();
            testMH();
        }
    }
}

$ java -XX:CompileCommand=dontinline,*::test* -XX:CompileCommand=print,*::test* FieldAccess
...
  # {method} {0x0000000118aca538} 'testDirect' '()I' in 'jsr292/FieldAccess'
...
  0x000000010be1716c: mov $0x7b,%eax
...
  # {method} {0x0000000118aca498} 'testMH' '()I' in 'jsr292/FieldAccess'
...
  0x000000010be1f3ec: movabs $0x76abb2f48,%r10 ; {oop(a 'java/lang/Class' = 'jsr292/FieldAccess')}
  0x000000010be1f3f6: mov 0x6c(%r10),%eax ;*invokevirtual getInt
                                                ; - java.lang.invoke.LambdaForm$MH015/708049632::getIntStatic_001@23
                                                ; - java.lang.invoke.LambdaForm$MH013/991505714::invokeExact_000_MT@15
                                                ; - jsr292.FieldAccess::testMH@3 (line 24)
...