Require target features to match exactly during inlining

[tmiasko]

In general it is not correct to inline a callee with a target features
that are subset of the callee. Require target features to match exactly
during inlining.

The exact match could be potentially relaxed, but this would require
identifying specific feature that are allowed to differ, those that need
to match, and those that can be present in caller but not in callee.

This resolves MIR part of #116573. For other concerns with respect to
the previous implementation also see areInlineCompatible in LLVM.

[rustbot]

r? @wesleywiser

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[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[oli-obk]

r? @oli-obk

@bors r+

[bors]

📌 Commit 011b260 has been approved by oli-obk

It is now in the queue for this repository.