RFR: 8295253: Remove kludge from v1_0/PerfDataBuffer.java

[Ioi Lam]

Remove code for supporting an ancient JDK version (1.4.2). We don't have any test cases for this code so it's unclear whether it still works or not.

Testing: tiers 1-4.

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Commit messages:
 - 8295253: Remove kludge from v1_0/PerfDataBuffer.java

Changes: https://git.openjdk.org/jdk/pull/11329/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11329&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295253
  Stats: 149 lines in 1 file changed: 0 ins; 148 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11329.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11329/head:pull/11329

PR: https://git.openjdk.org/jdk/pull/11329