* c-cppbuiltin.c (cb_register_builtins): Define LP64 builtins for
        LP64 targets.

        * doc/cpp.texi (Common Predefined Macros): Document __LP64__ and
        _LP64.

        * config/ia64/ia64.h (TARGET_CPU_CPP_BUILTINS): Do not define
        _LP64 macros here.
        * config/pa/pa.h (TARGET_CPU_CPP_BUILTINS): Likewise.

        * config/alpha/netbsd.h (TARGET_OS_CPP_BUILTINS): Remove call to
        NETBSD_OS_CPP_BUILTINS_LP64.
        * config/sh/netbsd-elf.h (TARGET_OS_CPP_BUILTINS): Likewise.
        * config/sparc/netbsd-elf.h (TARGET_OS_CPP_BUILTINS): Likewise.

        * config/netbsd.h (NETBSD_OS_CPP_BUILTINS_LP64): Remove.

From-SVN: r64259