[9] RFR(L): 8037816 : Fix for 8036122 breaks build with Xcode5/clang

[David Chase]

Revised patch, after some offline discussion with Stefan:

webrev: http://cr.openjdk.java.net/~drchase/8037816/webrev-9.05-09b/

interdiff from previous: http://cr.openjdk.java.net/~drchase/8037816/9.0508b-0509b.interdiff

(I recommend the interdiff)

The difference is that in the GC code, where PTR_FORMAT and INTPTR_FORMAT have
been used to express an intention (even though C++ compilers and standards conspire
against this) to preserve that intention.  There's likely to be some future change, but it is
important to preserve the intention till that change.

There was no change to the 8u patch (i.e., the use of PTR_FORMAT in the GC code was
preserved there already; I'm going to check the rest of the 8u patch to see if the INTPTR_FORMAT
introductions there conform to goals for the other parts of the code).

Testing so far has been minimal, but this is an extremely lightweight patch, and PTR_FORMAT
and INTPTR_FORMAT currently have identical macro expansion.  I thought I would get this up
for discussion/review first, then get the testing started.

David