RFR: 8253048: AArch64: When CallLeaf, no need to preserve callee-saved registers in caller

[Joshua Zhu]

8253048: AArch64: When CallLeaf, no need to preserve callee-saved registers in caller

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Commit messages:
 - 8253048: AArch64: When CallLeaf, no need to preserve callee-saved registers in caller

Changes: https://git.openjdk.java.net/jdk/pull/129/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=129&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253048
  Stats: 22 lines in 2 files changed: 0 ins; 0 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk/pull/129.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/129/head:pull/129

PR: https://git.openjdk.java.net/jdk/pull/129