Implement JVM_dladdr() for jdk27+ on AIX

[keithc-ca]

This fixes the link error seen in recent acceptance builds; e.g. https://openj9-jenkins.osuosl.org/job/Pipeline-OpenJDK-Acceptance/1210.

[keithc-ca]

Updated to remove the unwanted field dli_fbase.

[keithc-ca]

Jenkins compile aix jdknext depends ibmruntimes/openj9-openjdk-jdk#openj9-staging

[keithc-ca]

Updates:

• check for ENOMEM == errno
• include sys/ldr.h
• test AIXPPC instead of OMR_OS_AIX
• add missing casts

[keithc-ca]

Jenkins compile aix jdknext depends ibmruntimes/openj9-openjdk-jdk#openj9-staging

[pshipton]

Seems it built but then crashed.

18:38:09  Module=/home/jenkins/workspace/Build_JDKnext_ppc64_aix_Personal/build/aix-ppc64-server-release/jdk/lib/libawt.so
18:38:09  Module_base_address=090000000724D000
18:38:09  Target=2_90_20260401_79 (AIX 7.2)
18:38:09  CPU=ppc64 (16 logical CPUs) (0x780000000 RAM)
18:38:09  ----------- Stack Backtrace -----------
18:38:09  JNI_OnLoad+0xc (0x09000000072E7F30 [libawt.so+0x9af30])
18:38:09  Java_jdk_internal_loader_NativeLibraries_load+0x120 (0x09000000064E0A04 [libjava.so+0x8a04])

[keithc-ca]

The crash seen earlier is addressed by:

• not returning a pointer to freed memory
• handling the situation where the provided address refers to a function descriptor instead of a function directly

[pshipton]

Pls add tracepoints to JVM_dladdr().

[keithc-ca]

Tracepoints added in 4e85e02 (and rebased).

[pshipton]

Jenkins compile aix jdknext depends ibmruntimes/openj9-openjdk-jdk#openj9-staging

[keithc-ca]

That build should be expected to fail (jni_md.h not found) without ibmruntimes/openj9-openjdk-jdk#1203.

[pshipton]

I didn't think that happenes in these type of builds. The last build "worked", it just crashed afterwards.

[keithc-ca]

I think the previous crash prevented it from getting to the point where the missing header would be noticed, but I suppose we'll see.

[pshipton]

These builds don't include OpenJCEPlus, which I think is what exposed the "jni_md.h not found". Otherwise we would have noticed this earlier in the acceptance builds.

[pshipton]

12:43:46  /home/jenkins/workspace/Build_JDKnext_ppc64_aix_Personal/openj9/runtime/j9vm/javanextvmi.cpp:891:40: error: too few arguments provided to function-like macro invocation
12:43:46    891 |         Trc_JVM_dladdr_exit(addr, info, result);
12:43:46        |                                               ^
12:43:46  /home/jenkins/workspace/Build_JDKnext_ppc64_aix_Personal/build/aix-ppc64-server-release/vm/runtime/j9vm/ut_j9scar.h:2169:9: note: macro 'Trc_JVM_dladdr_exit' defined here
12:43:46   2169 | #define Trc_JVM_dladdr_exit(thr, P1, P2, P3) \
12:43:46        |         ^
12:43:46  [ 29%] Building CXX object runtime/gc_vlhgc/CMakeFiles/j9gcvlhgc_full.dir/ConfigurationIncrementalGenerational.cpp.o
12:43:46  /home/jenkins/workspace/Build_JDKnext_ppc64_aix_Personal/openj9/runtime/j9vm/javanextvmi.cpp:891:2: error: use of undeclared identifier 'Trc_JVM_dladdr_exit'
12:43:46    891 |         Trc_JVM_dladdr_exit(addr, info, result);
12:43:46        |         ^

[pshipton]

Jenkins compile aix jdknext depends ibmruntimes/openj9-openjdk-jdk#openj9-staging