RFR: 8294314: Minimize disabled warnings in hotspot [v16]

[Aleksey Shipilev]

On Wed, 28 Sep 2022 18:34:11 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Still having fun with it? I now have the capability to quickly build everything with GCC 9..12 (but 12 has problems on their own). GHA is a subset of that build matrix. I can give this PR a spin, if your PR is at stable point.

Current PR at d6c52a2a25edbe1c06f0d2303dac80129ede763f passes the matrix of:
 - `make hotspot`
 - GCC {9, 10, 11, 12}
 - {x86_32, x86_64, aarch64, armhf, ppc64le, s390x, riscv64}
 - {server, zero, minimal, client, optimized}
 - {fastdebug, release}

It only took ~350 CPU-hours and ~600 GB of disk space to build :P

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