RFR: 8201136: Move GC flags from globals.hpp to GC specific files

[Aleksey Shipilev]

On 04/05/2018 08:11 AM, Stefan Karlsson wrote:
> Please review this patch to move GC flags out of globals.hpp and into GC specific files.
> 
>  http://cr.openjdk.java.net/~stefank/8201136/webrev.01
>  https://bugs.openjdk.java.net/browse/JDK-8201136

Oooof, what a move! I like it, looks good.

*) In globals.hpp, L2987-..., you probably want to right-adjust the backslashes?

*) In gc_globals.hpp, we still have Use{CMS,Serial,G1,Parallel,...}GC -- is the intent to have these
in shared gc_globals.hpp, not in per-GC-globals.hpp, and check for GC support at init? In other
words, when conditional GC compilation arrives, we still have GC enabling flags available, but not
the GC-specific flags?

Thanks,
-Aleksey