RFR: 8309048: Remove malloc locker test case

[David Holmes]

On Mon, 29 May 2023 13:14:24 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> 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.

Looks fine. I couldn't find anything explaining the history of this test.

Thanks.

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14201#pullrequestreview-1449946999