RFR: 8232084: HotSpot build failed with GCC 9.2.1

[Yasumasa Suenaga]

Hi all,

Please review this change:

   JBS: https://bugs.openjdk.java.net/browse/JDK-8232084
   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8232084/webrev.00/


I tried to build OpenJDK on Fedora 30 x64 with GCC 9.2.1, but it was failed in
macroAssembler_x86.hpp and diagnosticArgument.cpp .
(Please see JBS for details)

This change has passed tests on submit repo.


Thanks,

Yasumasa (ysuenaga)