RFR: 8357218: G1: Remove loop in G1CollectedHeap::try_collect_fullgc [v4]

[Albert Mingkun Yang]

> Simple removing unnecessary loop in "caller" of `VM_G1CollectFull`, because an explicit full-gc always run-to-completion.
> 
> Test: tier1-3

Albert Mingkun Yang has updated the pull request incrementally with two additional commits since the last revision:

 - review
 - Revert "review"
   
   This reverts commit 666cc5a1cbc72453a09fdf4e9319bf140365859e.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25296/files
  - new: https://git.openjdk.org/jdk/pull/25296/files/666cc5a1..93c6e998

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25296&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25296&range=02-03

  Stats: 8 lines in 3 files changed: 0 ins; 4 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/25296.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25296/head:pull/25296

PR: https://git.openjdk.org/jdk/pull/25296