stabilization what to do: stabby stab stab

@ShoyuVanilla

merge candidate merging only equal certainty PR https://rust-lang.zulipchat.com/#narrow/channel/144729-t-types/topic/resolving.20equal.20regions/near/623504310 do not prefer trivially true candidates with -Znext-solver rust#163928
crater run with most recent changes (including the above)
triage crater run
update stab docs: opaque types without shoyu PR, remaining TODOs
include that in stab docs
Jana redo perf graph with all recent changes
include that perf graph in stab docs
fix docs.rs ICE [ICE]: cargo doc fails for the crate galvyn rust#163528 (fixed by Fix rustdoc ICE caused by mishandling of ambiguity errors rust#162782)
for features broken with the new solver, give them the GCE treatment of warning and falling back to old one, mainly transmutability
collect all test failures with the new solver https://hackmd.io/ydc_nIbHQqG-ctMDapXYTg#crashes
triage all crashes changes
triage clippy changes: thx @ShoyuVanilla
incremental tests rust-lang/rust@8759a95
ui test: error -> pass tests
ui test: pass -> error tests (https://hackmd.io/RQF9zqx8R3aBl_-gr2YU6w?both)
skim over error -> error ui test changes, look for horrible ones
update error index
go through open GitHub issues for next-solver https://hackmd.io/HVoK3ysqSeqW_1s-KIzy7w
quick history for stab FCP/context
start stabilization FCP stabilize -Znext-solver=globally rust#164209

post/during fcp

rustc-perf switch to new solver, stop forcing -Znext-solver=coherence
test suite, stop forcing -Znext-solver=coherence stabilize -Znext-solver=globally rust#164209
open PRs to fix affected crates tracked in Next-generation trait solver enabled on nightly rust#160895 and the crater report, also look at issues linking to that github issue

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