Valhalla JVM method signature update

[JasonFengJ9]

Valhalla JVM method signature update

Match the JNIEXPORT signatures in jvm.h and also the upstream updates.

This addresses the compilation failure:

21:31:36  /home/jenkins/workspace/Build_JDKnext_x86-64_linux_valhalla_Nightly/openj9/runtime/j9vm/valhallavmi.cpp:97:1: error: conflicting declaration of C function ‘jboolean JVM_IsFlatArray(JNIEnv*, jobject)’
21:31:36     97 | JVM_IsFlatArray(JNIEnv *env, jobject obj)
21:31:36        | ^~~~~~~~~~~~~~~
21:31:36  In file included from /home/jenkins/workspace/Build_JDKnext_x86-64_linux_valhalla_Nightly/openj9/runtime/j9vm/jvm.h:253,
21:31:36                   from /home/jenkins/workspace/Build_JDKnext_x86-64_linux_valhalla_Nightly/openj9/runtime/j9vm/valhallavmi.cpp:26:
21:31:36  /home/jenkins/workspace/Build_JDKnext_x86-64_linux_valhalla_Nightly/build/linux-x86_64-server-release/vm/runtime/j9vm/generated.h:628:28: note: previous declaration ‘jboolean JVM_IsFlatArray(JNIEnv*, jclass)’
21:31:36    628 | JNIEXPORT jboolean JNICALL JVM_IsFlatArray(JNIEnv *env, jclass cls);
21:31:36        |                            ^~~~~~~~~~~~~~~
21:31:36  gmake[6]: *** [runtime/j9vm/CMakeFiles/jvm.dir/valhallavmi.cpp.o] Error 1

Verified via a personal build

Signed-off-by: Jason Feng fengj@ca.ibm.com

[hangshao0]

LGTM.