JDK21 x86-64_alpine-linux testimage missing libTagMapTest

[smlambert]

There are a couple of issues with the testimage produced for the JDK21 x86-64_alpine-linux

• could not find agent library TagMapTest on the library path
• java.lang.UnsatisfiedLinkError: no TestFloatJNIArgs

JDK21 x64 alpine-linux which has 3 native test cases that do not pass (details here) and copying some of the details below for convenience.

• testList_1 failures rerun in Grinder/8615 - rerun in TCGrinder/3992

TEST: serviceability/jvmti/SetTag/TagMapTest.java
TEST: compiler/floatingpoint/TestFloatJNIArgs.java#id0
TEST: compiler/floatingpoint/TestFloatJNIArgs.java#id1

Failures indicate that the upstream build job did not produce all of the native test libs expected:

could not load native lib: java.lang.UnsatisfiedLinkError: no TestFloatJNIArgs in java.library.path: /home/jenkins/workspace/Grinder/jdkbinary/openjdk-test-image/jdk/jtreg/native

Error occurred during initialization of VM
Could not find agent library TagMapTest on the library path, with error: Error loading shared library libTagMapTest.so: No such file or directory

SL/Jan23 action: To look into testimage to see what it contains (to try and understand the native test failures above

/alpine/jdk-21.0.2+13-test-image/hotspot/jtreg/native # nm *.so | grep TestFloat
libTestFloatJNIArgs.so:
00000000000011f0 T Java_compiler_floatingpoint_TestFloatJNIArgs_add10floats
0000000000001280 T Java_compiler_floatingpoint_TestFloatJNIArgs_add15doubles
00000000000011a0 T Java_compiler_floatingpoint_TestFloatJNIArgs_add15floats
0000000000001220 T Java_compiler_floatingpoint_TestFloatJNIArgs_addFloatsInts
libTestFloatSyncJNIArgs.so:
0000000000001260 T Java_compiler_floatingpoint_TestFloatSyncJNIArgs_combine15doubles
00000000000011a0 T Java_compiler_floatingpoint_TestFloatSyncJNIArgs_combine15floats
/alpine/jdk-21.0.2+13-test-image/hotspot/jtreg/native # 

/alpine/jdk-21.0.2+13-test-image/hotspot/jtreg/native # ldd libTestFloatJNIArgs.so 
	/lib/ld-musl-x86_64.so.1 (0x7f4cca63c000)

/alpine/jdk-21.0.2+13-test-image/hotspot/jtreg/native # ldd libTestFloatSyncJNIArgs.so
	/lib/ld-musl-x86_64.so.1 (0x7f1ce9249000)

I believe that the shared libaries are not in the expected/right location for alpine-linux for some reason, which causes 3 testcases to fail. Recommending to not block the release with these 3 testcases and to exclude, but will raise a build issue with the goal to fix so we can reinclude these tests when ready.