[Chapel Merge] Add use CPtr to a valgrind test

Branch: refs/heads/master
Revision: ed3f143
Author: e-kayrakli
Log Message:

Merge pull request #16472 from e-kayrakli/cptr-fix-valgrind-test

Add use CPtr to a valgrind test

Follow up to https://github.com/chapel-lang/chapel/pull/16451

The test was missed because it doesn’t run in typical nightly setting.

The file compiles with this PR

[Trivial, not reviewed]

Modified Files:
M test/memory/elliot/valgrind/I-fail-without-working-valgrind.chpl

Compare: https://github.com/chapel-lang/chapel/compare/d56089dcedac...ed3f14367ed1