RFR: 8269909: getStack method in hprof.parser.Reader should use try-with-resource

[Lin Zang]

8269909: getStack method in hprof.parser.Reader should use try-with-resource

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Commit messages:
 - 8269909: getStack method in hprof.parser.Reader should use try-with-resource

Changes: https://git.openjdk.java.net/jdk/pull/4717/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4717&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269909
  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4717.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4717/head:pull/4717

PR: https://git.openjdk.java.net/jdk/pull/4717