RFR: 8294314: Minimize disabled warnings in hotspot [v9]

[Aleksey Shipilev]

On Wed, 12 Oct 2022 11:07:36 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > @shipilev In a "tenth time's the charm" spirit, here's what I do think is actually a PR that can be integrated.
> 
> Cool! I'll try to schedule the overnight build-matrix run to see if anything is broken.

I was able to build the matrix of:
 - `make hotspot`
 - GCC {9, 10}
 - {i686, x86_64, aarch64, powerpc64le, s390x, arm, riscv64, powerpc64}
 - {server, client, minimal, zero}
 - {release, fastdebug, slowdebug, optimized}

All these build with default warnings enabled, and they pass. So I think we are more or less safe with this minimization.

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PR: https://git.openjdk.org/jdk/pull/10414