do not apply noexcept to default members on ppc

Bug: v8:8062
Change-Id: I5a5c39c0b5cffdcb15444caa670919be6fc3d007
Reviewed-on: https://chromium-review.googlesource.com/1171199
Commit-Queue: John Barboza <jbarboza@ca.ibm.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55162}

src/base/compiler-specific.h

@@ -94,8 +94,9 @@
 
 // Allowing the use of noexcept by removing the keyword on older compilers that
 // do not support adding noexcept to default members.
-#if ((V8_GNUC_PREREQ(4, 9, 0) && !defined(V8_TARGET_ARCH_MIPS) && \
-      !defined(V8_TARGET_ARCH_MIPS64)) ||                         \
+#if ((V8_GNUC_PREREQ(4, 9, 0) && !defined(V8_TARGET_ARCH_MIPS) &&        \
+      !defined(V8_TARGET_ARCH_MIPS64) && !defined(V8_TARGET_ARCH_PPC) && \
+      !defined(V8_TARGET_ARCH_PPC64)) ||                                 \
      (defined(__clang__) && __cplusplus > 201300L))
 #define V8_NOEXCEPT noexcept
 #else