RFR: 8256633: Fix product build on Windows+Arm64 [v2]

[Bernhard Urban-Forster]

> Fix this warning:
> C:\work\openjdk-jdk\src\hotspot\cpu\aarch64\assembler_aarch64.hpp(508): error C2220: the following warning is treated as an error
> C:\work\openjdk-jdk\src\hotspot\cpu\aarch64\assembler_aarch64.hpp(508): warning C4390: ';': empty controlled statement found; is this the intent?
> 
> Thanks to @magicus to bring that to my attention.

Bernhard Urban-Forster has updated the pull request incrementally with one additional commit since the last revision:

  review feedback

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1312/files
  - new: https://git.openjdk.java.net/jdk/pull/1312/files/d2d85317..4927d0d0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1312&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1312&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1312.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1312/head:pull/1312

PR: https://git.openjdk.java.net/jdk/pull/1312