[jdk11u-dev] RFR: 8308116: jdk.test.lib.compiler.InMemoryJavaCompiler.compile does not close files

[Amos Shi]

Backport of [JDK-8308116](https://bugs.openjdk.org/browse/JDK-8308116)

Unclean Backport:
- `test/lib/jdk/test/lib/compiler/InMemoryJavaCompiler.java`
  - The `Copyright year` line is conflicting; merged manually.
  - This file can be considered as `Clean`

Test Succeeded in local Dev Apple M1 Laptop

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Commit messages:
 - Backport e9320f31dcc4ff5197e8c3bca504a7d5c1a9035e

Changes: https://git.openjdk.org/jdk11u-dev/pull/2395/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2395&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308116
  Stats: 33 lines in 1 file changed: 15 ins; 15 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2395.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2395/head:pull/2395

PR: https://git.openjdk.org/jdk11u-dev/pull/2395