8254827: JVMCI: Enable it for Windows+AArch64 #685
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.
@lewurm This change now passes all automated pre-integration checks.
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