RFR: 8256213: Remove os::split_reserved_memory [v2]

[Yumin Qi]

> Hi, Please review 
>   This is the second step for removing problematic os::split_reserved_memory on Windows. The first step has been accomplished under bug 8255917 (https://bugs.openjdk.java.net/browse/JDK-8255917).
>   This step remove the function split_reserved_memory which no longer be called after first step.
> 
> Tests: tier1-4
> 
> Thanks
> Yumin

Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:

  Remove unused comment

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1825/files
  - new: https://git.openjdk.java.net/jdk/pull/1825/files/4318c9a3..a7c49002

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1825&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1825&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1825.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1825/head:pull/1825

PR: https://git.openjdk.java.net/jdk/pull/1825