RFR: 8290327: Remove java/lang/reflect/callerCache/ReflectionCallerCacheTest.java from ProblemList-Xcomp.txt

[Mandy Chung]

It's expected that [JDK-8287596](https://bugs.openjdk.org/browse/JDK-8287596) has resolved [JDK-8288286](https://bugs.openjdk.org/browse/JDK-8288286). Remove ReflectionCallerCacheTest.java from the problem list for test execution.

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Commit messages:
 - 8290327: Remove java/lang/reflect/callerCache/ReflectionCallerCacheTest.java from ProblemList-Xcomp.txt

Changes: https://git.openjdk.org/jdk/pull/9500/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9500&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290327
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9500.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9500/head:pull/9500

PR: https://git.openjdk.org/jdk/pull/9500