RFR: JDK-8252802: java launcher should set MALLOCOPTIONS and LDR_CNTRL in order to use 64KB pages on AIX

[Varada M]

DeCapo Benchmark Results (3 runs) :  

Before : 
===== DaCapo 9.12 h2 PASSED in 281402 msec =====
===== DaCapo 9.12 h2 PASSED in 269818 msec =====
===== DaCapo 9.12 h2 PASSED in 279279 msec =====
 
After:
===== DaCapo 9.12 h2 PASSED in 279192 msec =====
===== DaCapo 9.12 h2 PASSED in 269769 msec =====
===== DaCapo 9.12 h2 PASSED in 271577 msec ===== 

Environmental variables LDR_CNTRL and MALLOCOPTIONS has caused test/jdk/java/lang/ProcessBuilder/Basic.java failure.
Additional environmental variables has to removed from removeAixExpectedVars().

JBS Issue : [JDK-8252802](https://bugs.openjdk.org/browse/JDK-8252802)

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Commit messages:
 - JDK-8252802: java launcher should set MALLOCOPTIONS and LDR_CNTRL in order to use 64KB pages on AIX

Changes: https://git.openjdk.org/jdk/pull/17906/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17906&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8252802
  Stats: 20 lines in 2 files changed: 17 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17906.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17906/head:pull/17906

PR: https://git.openjdk.org/jdk/pull/17906