[jdk11u-dev] RFR: 8288445: AArch64: C2 compilation fails with guarantee(!true || (true && (shift != 0))) failed: impossible encoding

[William Kemper]

[JDK-8288445](https://bugs.openjdk.org/browse/JDK-8288445)
AArch64: C2 compilation fails with guarantee(!true || (true && (shift != 0))) failed: impossible encoding

Backport is not clean, but is not complicated. Some of the instructions patched in later releases do not exist in 11. The test passes _before_ and _after_ the patch is applied.

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Commit messages:
 - Backport b4490386fe348250e88347526172c1c27ef01eba

Changes: https://git.openjdk.org/jdk11u-dev/pull/1462/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1462&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288445
  Stats: 97 lines in 2 files changed: 83 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1462.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1462/head:pull/1462

PR: https://git.openjdk.org/jdk11u-dev/pull/1462