hg: jdk/sandbox: 8232084: HotSpot build failed with GCC 9.2.1

[chris.hegarty at oracle.com]

Changeset: 9f5b92d5a1b2
Author:    ysuenaga
Date:      2019-10-18 09:57 +0900
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/9f5b92d5a1b2

8232084: HotSpot build failed with GCC 9.2.1
Reviewed-by: sspitsyn, cjplummer, dholmes, iklam

! src/hotspot/cpu/x86/macroAssembler_x86.hpp
! src/hotspot/share/services/diagnosticArgument.cpp
! src/hotspot/share/utilities/compilerWarnings.hpp
! src/hotspot/share/utilities/compilerWarnings_gcc.hpp