RFR: 8298055: AArch64: fastdebug build fails after JDK-8247645

[Jie Fu]

On Sat, 3 Dec 2022 05:35:51 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Please review this trivial change fixing a fastdebug build failure due to warnings being treated as errors after JDK-8247645.
> 
> Testing: fastdebug build fine with this change on linux-aarch64 platform.

src/hotspot/cpu/aarch64/assembler_aarch64.hpp line 2438:

> 2436:     default:
> 2437:       ShouldNotReachHere();
> 2438:       Rm = 0;  // unreachable

Instead of adding this line, how about initiating `Rm` at declaration like `int Rm = 0;`?

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PR: https://git.openjdk.org/jdk/pull/11496