RFR: 8365245: Move size reducing operations to GrowableArrayWithAllocator

[Kim Barrett]

Please review this change to GrowableArray to move size reducing operations
from GrowableArrayBase and GrowableArrayView to GrowableArrayWithAllocator.
See JBS for rationale for this move.

This is mostly just a simple code motion change, with the moved functions
being updated to account for different name lookup rules now that they are in
a class with a class template base class. For the most part this refactoring
didn't require any client code changes. All but one use of one moved function
was with a GrowableArrayWithAllocator-derived class, so not affected by moving
the functions. The one exception was a test of ZArraySlice that was modified
to no longer use GA::pop().

Testing: mach5 tier1.

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

Commit messages:
 - move pop to GAWA, fixing gtest
 - move remove_at to GAWA
 - move remove_if_existing to GAWA
 - move remove to GAWA
 - move remove_till/remove_range to GAWA
 - move delete_at to GAWA
 - move trunc_to to GAWA
 - move clear() to GAWA

Changes: https://git.openjdk.org/jdk/pull/26726/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26726&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365245
  Stats: 134 lines in 2 files changed: 69 ins; 64 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26726.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26726/head:pull/26726

PR: https://git.openjdk.org/jdk/pull/26726