hg: jdk/jdk13: 8226627: assert(t->singleton()) failed: must be a constant

[jamsheed.c.m at oracle.com]

Changeset: a30c86af2eb7
Author:    jcm
Date:      2019-07-05 00:24 -0700
URL:       http://hg.openjdk.java.net/jdk/jdk13/rev/a30c86af2eb7

8226627: assert(t->singleton()) failed: must be a constant
Summary: Implemented constant folding for MaxFD, MinFD.
Reviewed-by: thartmann, bsrbnd, pli

! src/hotspot/share/opto/addnode.cpp
! src/hotspot/share/opto/addnode.hpp
! src/hotspot/share/opto/library_call.cpp
! src/hotspot/share/opto/type.cpp