Java GC descriptor vs. tree_int_cst on 64-bit platforms

[Richard Kenner]

    (I may be misunderstanding the code here.)  It looks like there is
    confusion about what goes into an INTEGER_CST node, or equivalently
    what the arguments to build_int_2 should be.  On a 64-bit host and
    target, there are two possibilities:

    2) The low field is 64 bits and the high field can be ignored.  (The
    declaration of struct tree_int_cst seems to imply this, since both
    fields end up 64 bits wide.  So does the comment in tree.h.)

Both fields are 64-bit and both are used.  If it's a 64-bit constant,
the high bits must be either -1 or 0.