ubsan: Disable vptr validation on powerpc64.

Should fix sanitizer-ppc64-linux1 bot.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@247493 91177308-0d34-0410-b5e6-96231b3b80d8

Author: pcc

lib/ubsan/ubsan_type_hash_itanium.cc

@@ -193,7 +193,7 @@ struct VtablePrefix {
   std::type_info *TypeInfo;
 };
 
-#if SANITIZER_LINUX
+#if SANITIZER_LINUX && !defined(__powerpc64__)
 bool isValidVptr(void *Vtable) {
   // Validate the memory permissions of the vtable pointer and the first
   // function pointer in the vtable. They should be r-- or r-x and r-x
@@ -218,7 +218,7 @@ bool isValidVptr(void *Vtable) {
   }
   return false;
 }
-#else  // !SANITIZER_LINUX
+#else  // !SANITIZER_LINUX || __powerpc64__
 bool isValidVptr(void *Vtable) {
   return true;
 }

test/ubsan/lit.common.cfg

@@ -78,5 +78,5 @@ if config.host_os == 'Windows':
 if config.target_arch.startswith('arm') == False:
   config.available_features.add('stable-runtime')
 
-if config.host_os == 'Linux':
+if config.host_os == 'Linux' and config.target_arch != 'powerpc64':
   config.available_features.add('vptr-validation')