RFR: 8309048: Remove malloc locker test case

[Leo Korinth]

There is a bunch of tests that are used to test critical section/gc locker. One of the test is named malloc. In that test, JNI code is doing a loop of `malloc()` followed `sleep()` followed by a `free()`. There is no JVM lock implementation to be tested on malloc/free. Let us save test time, code complexity and confusion by removing this test. 

(Oracle) hs-tier5 testing passed on x86-64.

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Commit messages:
 - 8309048: Remove malloc locker test case

Changes: https://git.openjdk.org/jdk/pull/14201/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14201&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309048
  Stats: 241 lines in 9 files changed: 0 ins; 240 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14201.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14201/head:pull/14201

PR: https://git.openjdk.org/jdk/pull/14201