8276175: codestrings.validate_vm gtest still broken on ppc64 after JDK-8276046

Backport-of: b889f2a88a5e182d2424b741d8fedf2c784442f1

Author: GoeLin

test/hotspot/gtest/code/test_codestrings.cpp

@@ -25,8 +25,6 @@
 
 #ifndef PRODUCT
 #ifndef ZERO
-// Neither ppc nor s390 compilers use code strings.
-#if !defined(PPC) && !defined(S390)
 
 #include "asm/macroAssembler.inline.hpp"
 #include "compiler/disassembler.hpp"
@@ -259,12 +257,16 @@ static void buffer_blob_test()
     BufferBlob::free(blob);
 }
 
+#if defined(PPC) || defined(S390)
+// Neither ppc nor s390 compiler use code strings
+TEST_VM(codestrings, DISABLED_validate)
+#else
 TEST_VM(codestrings, validate)
+#endif
 {
     code_buffer_test();
     buffer_blob_test();
 }
 
-#endif // not S390 not PPC
 #endif // not ZERO
 #endif // not PRODUCT