[Darwin, PPC, committed] Emit uppercase versions of ppc defines.

[Iain Sandoe]

Emit __PPC__ (32b) and __PPC64__ (64bit) as per the other members
of the PowerPC port.  Darwin has always emitted __ppc__ and __ppc64__
but some testcases rely on the upper case variants.

tested on powerpc-darwin9, applied to mainline.
thanks
Iain

2019-06-23  Iain Sandoe  <i...@sandoe.co.uk>

        * config/rs6000/darwin.h: (__PPC__, __PPC64__): New.

diff --git a/gcc/config/rs6000/darwin.h b/gcc/config/rs6000/darwin.h
index ee949f2..2df617d 100644
--- a/gcc/config/rs6000/darwin.h
+++ b/gcc/config/rs6000/darwin.h
@@ -54,7 +54,9 @@
   do                                                   \
     {                                                  \
       if (!TARGET_64BIT) builtin_define ("__ppc__");   \
+      if (!TARGET_64BIT) builtin_define ("__PPC__");   \
       if (TARGET_64BIT) builtin_define ("__ppc64__");  \
+      if (TARGET_64BIT) builtin_define ("__PPC64__");  \
       builtin_define ("__POWERPC__");                  \
       builtin_define ("__NATURAL_ALIGNMENT__");                \
       darwin_cpp_builtins (pfile);                     \