RFR: 8256633: Fix product build on Windows+Arm64

[Magnus Ihse Bursie]

On Thu, 19 Nov 2020 09:17:58 GMT, Bernhard Urban-Forster <burban at openjdk.org> wrote:

> 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.

Looks good and trivial.

(And a good reminder why if statements without curly braces seldom are a good thing...)

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