JRE-1124 Performance regression with jbsdk8u202b1467.2

This backport from jdk9 causes huge performance drop and probably leads to more frequent crashes (JRE-1175 Crashes with 1.8.202)

Revert "8155635: C2: Mixed unsafe accesses break alias analysis Reviewed-by: kvn"
This reverts commit 17231d8a

(cherry picked from commit c4e39dfc7a8903a4cfbc1a29a28a1aa5f1f3b3b8)
5 files changed