[test] Canonicalize PowerPC detection macros to __powerpc__

Author: MaskRay

clang/test/Sema/128bitfloat.cpp

@@ -7,7 +7,7 @@
 
 #if defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__)
 
-#if defined(__ppc__)
+#if defined(__powerpc__)
 template <typename> struct __is_float128 { static constexpr bool value = false; };
 template <> struct __is_float128<__float128> { static constexpr bool value = true; };
 static_assert(__is_float128<__ieee128>::value, "__ieee128 aliases to __float128");
@@ -45,7 +45,7 @@ int g(int x, __float128 *y) {  // expected-error {{__float128 is not supported o
 #endif
 #endif
 
-#ifdef __ppc__
+#ifdef __powerpc__
 __ibm128 i;
 template <> struct __is_floating_point_helper<__ibm128> {};
 int w(int x, __ibm128 *y) {

clang/test/Sema/attr-mode.c

@@ -46,7 +46,7 @@ typedef _Complex double c32 __attribute((mode(SC)));
 int c32_test[sizeof(c32) == 8 ? 1 : -1];
 typedef _Complex float c64 __attribute((mode(DC)));
 
-#if !defined(__ppc__) && !defined(__mips__) // Note, 'XC' mode is illegal for PPC64 and MIPS machines.
+#if !defined(__powerpc__) && !defined(__mips__) // Note, 'XC' mode is illegal for PPC64 and MIPS machines.
 typedef _Complex float c80 __attribute((mode(XC)));
 #endif