8016491: PPC64 (part 2): Clean up PPC defines.
Summary: Distinguish PPC, PPC64 and PPC32. PPC should guard code needed on any PPC system. PPC32 and PPC64 should guard code needed in a port for the ppc64 or ppc32 instruction set.
Reviewed-by: kvn
os_family = linux
arch = ppc
arch_model = ppc
os_arch = linux_ppc
os_arch_model = linux_ppc
lib_arch = ppc
compiler = gcc
gnu_dis_arch = ppc
sysdefs = -DLINUX -D_GNU_SOURCE -DPPC32