Refactor for latest JDK 20

.github/workflows/experimental.yml

@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-java@v3
         with:
-          java-version: '19'
+          java-version: '20-ea'
           distribution: 'temurin'
           cache: gradle
       - name: Build with Gradle

src/jmh/java/org/joml/jmh/Bench.java

@@ -65,7 +65,6 @@ public class Bench {
     private final Matrix4fvBB m4vbb = new Matrix4fvBB();
     private final Matrix4fvArr m4varr = new Matrix4fvArr();
     private final ByteBuffer bb = allocateDirect(16<<2).order(nativeOrder());
-    private final long bb_addr = WithJvmci.address(bb);
     private final FloatBuffer fb = bb.asFloatBuffer();
     private final Quaternionf qa = new Quaternionf();
     private final Quaternionf qb = new Quaternionf();

src/jmh/java/org/joml/jmh/Matrix4fn.java

@@ -36,7 +36,7 @@ public class Matrix4fn {
     public static final MethodHandle noop2ForPanama = getNoopForPanama();
     private static MethodHandle getNoopForPanama() {
         return Linker.nativeLinker().downcallHandle(
-                SymbolLookup.loaderLookup().lookup("noop2ForPanama").get(),
+                SymbolLookup.loaderLookup().find("noop2ForPanama").get(),
                 FunctionDescriptor.ofVoid(JAVA_LONG, JAVA_LONG)
         );
     }