RFR: 8256254: Convert vmIntrinsics::ID to enum class [v2]

[Claes Redestad]

On Tue, 17 Nov 2020 23:16:17 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> This PR is follows the same style as https://github.com/openjdk/jdk/pull/276, except this time I am converting `vmIntrinsics::ID` to `vmIntrinsicID`:
>> 
>> * Convert `vmIntrinsics::SID` to `enum class` to provide better type safety.
>> * Also, put this enum class in the top level, so it can be forward-declared. I.e., `enum class vmIntrinsicID : int;`. This avoids excessive inclusion of vmIntrinsics.hpp and vmSymbols.hpp (which were included indirectly by almost every hotspot source files).
>>   * vmIntrinsics.hpp: was included 805 times, now included 414 times
>>   * vmSymbols.hpp:  was included 805 times, now include 394 times
>>   * Note: more #include reduction will be done in [JDK-8256424](https://bugs.openjdk.java.net/browse/JDK-8256424)
>> 
>> Many files are changed, but most of them are minor
>> * Added missing dependencies of vmSymbols.hpp and/or vmIntrinsics.hpp
>> * safe conversion between vmIntrinsicID and integer types (see comments around `vmIntrinsics::as_int()`)
>> 
>> Since we have a lot of references like `vmIntrinsics::_invokeGeneric`, I added aliases like
>> 
>> static const vmIntrinsicID vmIntrinsics::_invokeGeneric = vmIntrinsicID::_invokeGeneric
>> 
>> so we don't need to change over a thousand `vmIntrinsics::XXX` to `vmIntrinsicID::XXX`.
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   @cl4es reviews

Marked as reviewed by redestad (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/1237