RFR: 8259037: livenmethods cannot find hsdis library

[Yasumasa Suenaga]

`livenmethods` CLHSDB command could not find hsdis library even though it deployed to `$JAVA_HOME/lib/server/`.

sun.jvm.hotspot.debugger.DebuggerException: /usr/local/jdk-15.0.1/lib/amd64/hsdis-amd64.so: cannot open shared object file: No such file or directory
        at jdk.hotspot.agent/sun.jvm.hotspot.asm.Disassembler.load_library(Native Method)
        at jdk.hotspot.agent/sun.jvm.hotspot.asm.Disassembler.<init>(Disassembler.java:95)
        at jdk.hotspot.agent/sun.jvm.hotspot.asm.Disassembler.decode(Disassembler.java:52)
        at jdk.hotspot.agent/sun.jvm.hotspot.asm.Disassembler.decode(Disassembler.java:43)
        at jdk.hotspot.agent/sun.jvm.hotspot.ui.classbrowser.HTMLGenerator.genHTML(HTMLGenerator.java:1435)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$45.doit(CommandProcessor.java:1651)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2051)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2021)
        at jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1901)
        at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:99)
        at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:40)
        at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:280)
        at jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:483)

JDK directory layout has been changed since JDK 9, however `livenmethods` hasn't followed it yet.

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Commit messages:
 - 8259037: livenmethods cannot find hsdis library

Changes: https://git.openjdk.java.net/jdk/pull/1920/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1920&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259037
  Stats: 76 lines in 2 files changed: 26 ins; 19 del; 31 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1920.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1920/head:pull/1920

PR: https://git.openjdk.java.net/jdk/pull/1920