[jdk17u-dev] RFR: 8279560: AArch64: generate_compare_long_string_same_encoding and LARGE_LOOP_PREFETCH alignment

[Dmitry Chuyko]

This is a trivial follow-up to JDK-8268231 that puts loop alignment in the right place. It can improve the intrinsic performance on some aarch64 implementations.

Testing: jtreg tier1, tier2, test/hotspot/jtreg/compiler/intrinsics/string on Graviton 2.

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Commit messages:
 - Backport 126328cb6218a93d23ed6169d7e52fb2719528ed

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/191/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=191&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279560
  Stats: 4 lines in 1 file changed: 1 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/191.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/191/head:pull/191

PR: https://git.openjdk.java.net/jdk17u-dev/pull/191