RFR: 8224201: Simplify JVM flag macro expansions

[Stefan Karlsson]

Hi all,

Please review this patch to simplify how we generate the different parts 
of the JVM flags code.

https://cr.openjdk.java.net/~stefank/8224201/webrev.01/
https://bugs.openjdk.java.net/browse/JDK-8224201

Notable parts of the patch:
- Introduces a ALL_FLAGS macro, used to expand code for all flags.
- Uses the ALL_FLAGS where appropriate.
- Constraints list didn't expand JVMCI flags. Fixed by using ALL_FLAGS.
- Moved <sub-system>_globals.hpp generated declarations to be expanded 
in globals.hpp.
- Unified FLAG_MEMBER and FLAG_MEMBER_WITH_TYPE into FLAG_MEMBER_ENUM 
and change names accordingly.

This change makes it easier to do future changes to the JVM flags 
handling code. For example: "JDK-8224203Remove need to specify type when 
using FLAG_SET macros"

Compiled on tier1 platforms.

Thanks,
StefanK