RFR: 8327201: C2: Uninitialized VLoop::_pre_loop_end after JDK-8324890

[Aleksey Shipilev]

On Wed, 6 Mar 2024 02:21:10 GMT, Joshua Cao <duke at openjdk.org> wrote:

> As Aleksey pointed out, the issue seems innocuous. It seems that all code that uses `pre_loop_end` are called from the main loop, and the field is always initialized for main loops. But we should still avoid uninitialized fields.
> 
> Passing hotspot tier1 locally on my Linux machine.

Marked as reviewed by shade (Reviewer).

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

PR Review: https://git.openjdk.org/jdk/pull/18130#pullrequestreview-1919183962