autosetup: detect the via-ir-required family by its remediation hint

[shellygr]

The bug

_detect_via_ir_required matched one literal solc phrasing:

marker = "only available using the via-ir pipeline"

solc has more than one way of saying the same thing. A corpus project hit:

UnimplementedFeatureError: Copying of type struct S memory[] memory to storage is not
supported in legacy (only supported by the IR pipeline). Hint: try compiling with
`--via-ir` (CLI) or the equivalent `viaIR: true` (Standard JSON)

That phrasing was missed, so solc_via_ir_map stayed all-false, compilation failed, autosetup
misattributed it to imports, patched 2253 files, failed again, reverted, and reported
import-patch-failed. Nothing about imports was broken.

The fix

Match the family by the remediation hint rather than the diagnostic wording — the --via-ir
flag, the viaIR: true JSON key, or "(via-)ir pipeline" — against whitespace-normalized text, since
solc hard-wraps at a fixed width and breaks tokens mid-word.

Two constraints make that safe:

• Only diagnostics that offer no other remedy. solc >= 0.8.13 appends the same --via-ir hint to
  every stack-too-deep and YulException, where the optimizer ladder should run first. Those are
  excluded, so stack_too_deep_via_ir keeps its ladder.
• Attribution stays inside one diagnostic block. Phrasing (b) usually arrives from a
  whole-project compile with no Compiling <path>... line to key on, so the detector falls back to
  the --> source location — but only one belonging to the same diagnostic. An arrow from an
  adjacent warning names an unrelated contract.

Review

An adversarial review confirmed five defects in the first commit, all fixed in bf68100: the
stack-too-deep hijack above; an unbounded --> scan that attributed via-ir to a neighbouring
warning's file; a missing word boundary that matched "theIR pipeline" in a source-line comment; and
two untested regex alternatives plus a missing negative test — both now pinned, with mutation
evidence that the new tests fail when each alternative is removed.

513 passed, 9 skipped; pyright clean.

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