[Backport] 8255000: C2: Unify IGVN processing when loop opts are over #916
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[Backport] 8255000: C2: Unify IGVN processing when loop opts are over
Summary: it include 3 patches
8255000: C2: Unify IGVN processing when loop opts are over
8255400: Shenandoah: C2 failures after JDK-8255000
8255120: C2: assert(outer->outcnt() >= phis + 2 && outer->outcnt() <= phis + 2 + stores + 1) failed: only phis
Testing: CICD
Reviewers: wangzhuo, yueshi.zwj
Issue: #915