RFR: JDK-8303606: Memory leaks in Arguments::parse_each_vm_init_arg [v2]

[Justin King]

> Addresses various memory leaks identified by LSan related to Arguments::parse_each_vm_init_arg.

Justin King has updated the pull request incrementally with one additional commit since the last revision:

  Add missing const_cast
  
  Signed-off-by: Justin King <jcking at google.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12867/files
  - new: https://git.openjdk.org/jdk/pull/12867/files/822d9bd2..167c4b5a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12867&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12867&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12867.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12867/head:pull/12867

PR: https://git.openjdk.org/jdk/pull/12867