RFR: 8294751: Zero: Allow larger default heaps

[Aleksey Shipilev]

On Wed, 5 Oct 2022 16:41:40 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Do we need to overhaul the other combinations as well? I don't see why we have to artificially limit the heap sizes. 

Probably. But as always with ergonomics, it might have unintended consequences.
 
> Also, if you want to do it for only ZERO for now, I think it's better to set the value inside compiler_globals_pd.hpp

Yeah, @tstuefe asked about this in the previous PR too. Let's move both flags to that `.hpp` then. See new commit.

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PR: https://git.openjdk.org/jdk/pull/10552