JDK20 requires implementation of JVM_VirtualThreadHideFrames()

[keithc-ca]

Uses introduced in 8293613: need to properly handle and hide tmp VTMS transitions.

Staging builds are currently failing (e.g. s390x):

04:49:16  === Output from failing command(s) repeated here ===
04:49:16  * For target support_native_java.base_libjava_BUILD_LIBJAVA_link:
04:49:16  /home/jenkins/workspace/Build_JDKnext_s390x_linux_OpenJDK/build/linux-s390x-server-release/support/native/java.base/libjava/VirtualThread.o:(.data.rel.methods+0x70): undefined reference to `JVM_VirtualThreadHideFrames'
04:49:16  collect2: error: ld returned 1 exit status

[pshipton]

@tajila @fengxue-IS @babsingh fyi
For now Keith will implement a stub so we can continue building jdk20.

[fengxue-IS]

@thallium is taking a look at this issue

[tajila]

@thallium @fengxue-IS how close is this to completion?

[thallium]

@tajila We are mainly waiting for #16654 to be merged, #17125 is just some refactor.