The SysV/Win64 record-return classifier — ClassifyRecordReturn plus its five
leaf predicates (IsRecordManagedClean, IsRecordAllIntegerLeaves,
IsRecordAllFloatLeaves, IsRecordAllIntOrFloatLeaves, EightbyteIsSSE) — existed
as byte-identical twins in TCodeGenQBE and TNativeBackend (~145 lines each).
This is a drift-prone ABI decision table that both backends must keep in
lockstep; a divergence would silently misclassify a record return on one
backend only.
Move the logic to free functions in blaise.codegen (Recret* — renamed to avoid
colliding with the backend methods, since Blaise resolves an unqualified call
inside a method to the method, not the unit function). Only the top-level
classifier consults the target OS (the Win64 aggregate rule), so it takes a
TTargetDesc parameter; the leaf predicates are target-independent pure type
walks. Each backend keeps its method as a one-line delegator, so every
existing Self.X call site is unchanged.
Validated behaviour-preserving: native .s AND QBE IR are byte-identical
pre/post for a record-return program exercising every return class
(rcInt1/rcInt2/rcSSE1/rcSSE2/rcIntSSE/rcSSEInt/rcSret/rcWin64-clean). All four
self-host fixpoints (QBE, native, internal-assembler, warm-cache) pass; full
suite OK (3853 tests) on both QBE-built and native-built test runners.
Implements item F4 of Andrew's native-codegen de-duplication plan — the
highest-value, lowest-risk cross-backend hoist.
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