codestrings.validate_vm gtest still broken on ppc64 after JDK-8276046

JDK-8276046 failed to work because the #ifdef PPC was added to the existing group of #ifdefs at the very start of test_codestrings.cpp.

However, PPC is not a primary macro but gets set via macros.hpp if one of PPC32 or PPC64 is set. Therefore this only works after inclusion of macro.hpp. (Works for ZERO and PRODUCT, since those are primary macros)