[jdk17u-dev] RFR: 8292713: Unsafe.allocateInstance should be intrinsified without UseUnalignedAccesses

[Aleksey Shipilev]

Clean backport to improve ARM32 performance in 17u.

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Commit messages:
 - Backport c0623972cffdbcd7f80e84a1ec344fd382a4a5cc

Changes: https://git.openjdk.org/jdk17u-dev/pull/1389/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1389&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292713
  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1389.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1389/head:pull/1389

PR: https://git.openjdk.org/jdk17u-dev/pull/1389