Bugzilla bug 265501: compilers do not define _LP64 implicitly. _LP64 is defined by <sys/isa_defs.h>.  So we need to test for the processor macros directly.
Bugzilla bug 265501: compilers do not define _LP64 implicitly. _LP64 is
defined by <sys/isa_defs.h>.  So we need to test for the processor macros
directly.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub