RFR: 8283689: Update the foreign linker VM implementation [v7]

[Jorn Vernee]

On Tue, 10 May 2022 20:53:37 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> src/hotspot/share/utilities/growableArray.hpp line 151:
>> 
>>> 149:     return _data;
>>> 150:   }
>>> 151: 
>> 
>> This accessor is added to be able to temporarily view a stable GrowableArray instance as a C-style array. It is used to by `NativeCallConv` and `RegSpiller` in `foreign_globals.hpp`.
>> 
>> GrowableArray already has an `adr_at` accessor that does something similar, but using `adr_at(0)` fails on empty growable arrays since it also performs a bounds check. So it can not be used.
>
> Any problems with migrating `CallConv` and `RegSpiller`away from ` VMReg* + int` to `GrowableArray<VMReg>`?

I'll try migrating to `GrowableArray`

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PR: https://git.openjdk.java.net/jdk/pull/7959