RFR: 8254827: JVMCI: Enable it for Windows+AArch64 [v3]

[Tom Rodriguez]

On Tue, 20 Oct 2020 15:46:36 GMT, Bernhard Urban-Forster <burban at openjdk.org> wrote:

>> Use r18 as allocatable register on Linux only.
>> 
>> A bootstrap works now (it has been crashing before due to r18 being allocated):
>> $ ./windows-aarch64-server-fastdebug/bin/java.exe -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler -XX:+BootstrapJVMCI -version
>> Bootstrapping JVMCI................................. in 17990 ms
>> (compiled 3330 methods)
>> openjdk version "16-internal" 2021-03-16
>> OpenJDK Runtime Environment (fastdebug build 16-internal+0-adhoc.NORTHAMERICAbeurba.openjdk-jdk)
>> OpenJDK 64-Bit Server VM (fastdebug build 16-internal+0-adhoc.NORTHAMERICAbeurba.openjdk-jdk, mixed mode)
>> 
>> Jtreg tests `test/hotspot/jtreg/compiler/jvmci` are passing as well.
>
> Bernhard Urban-Forster has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
> 
>  - add missing precompiled.hpp include
>  - Merge remote-tracking branch 'upstream/master' into 8254827-enable-jvmci-win-aarch64
>  - rename argument to canUsePlatformRegister
>  - comment for platformRegister
>  - 8254827: JVMCI: Enable it for Windows+AArch64
>    
>    Use r18 as allocatable register on Linux only.
>    
>    A bootstrap works now (it has been crashing before due to r18 being allocated):
>    ```console
>    $ ./windows-aarch64-server-fastdebug/bin/java.exe -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler -XX:+BootstrapJVMCI -version
>    Bootstrapping JVMCI................................. in 17990 ms
>    (compiled 3330 methods)
>    openjdk version "16-internal" 2021-03-16
>    OpenJDK Runtime Environment (fastdebug build 16-internal+0-adhoc.NORTHAMERICAbeurba.openjdk-jdk)
>    OpenJDK 64-Bit Server VM (fastdebug build 16-internal+0-adhoc.NORTHAMERICAbeurba.openjdk-jdk, mixed mode)
>    ```
>    
>    Jtreg tests `test/hotspot/jtreg/compiler/jvmci` are passing as well.

Marked as reviewed by never (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/685