RFR: 8280476: [macOS] : hotspot arm64 bug exposed by latest clang [v2]

[Daniel D.Daugherty]

> A trivial fix to solve undefined behavior in src/hotspot/cpu/aarch64/immediate_aarch64.cpp:
> replicate().
> 
> I was not able to reproduce the reported failure using:
> 
>   Xcode: Version 13.2.1 (13C100) which includes clang Apple LLVM 13.0.0 (clang-1300.0.29.30)
> 
> so I'm moving forward with the proposed fix from a code inspection
> point of view.
> 
> I've tested this fix with Mach5 Tier[1-6]. Tier1 and Tier2 have completed with
> no failures. Tier[3-6] are still running.

Daniel D. Daugherty has updated the pull request incrementally with one additional commit since the last revision:

  kimbarrett and adinn CR changes

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7270/files
  - new: https://git.openjdk.java.net/jdk/pull/7270/files/562ceb51..e4afa9e6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7270&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7270&range=00-01

  Stats: 5 lines in 1 file changed: 4 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7270.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7270/head:pull/7270

PR: https://git.openjdk.java.net/jdk/pull/7270