Files
sx/tests/expected
agra 794a49e938 ffi 1.9: 4×f64 HFA round-trip through #objc_call (UIEdgeInsets shape)
105/105 regression tests pass (+ffi-objc-call-07-fp-hfa-return).

Same round-trip pattern as 1.8 — register an Obj-C class at
runtime with class_addMethod, IMP returns specific non-zero values,
#objc_call reads them back — but for an all-double 32 B HFA
instead of a 24 B int aggregate.

Locks in the f32-vs-f64 landmine that bit us when we first
wrote safeAreaInsets in uikit.sx: the homogeneous-float-aggregate
ABI routes 1..4 f32 or f64 fields through v0..v3 (AAPCS64) /
xmm0..xmm3 (SysV AMD64) WITHOUT integer coercion. As long as the
LLVM call-site function type carries the precise struct (which
our `objc_msg_send` arm does), the backend lowers it correctly.

This is the smaller cousin of 1.8 — 1.8 needed an emit_llvm code
change to make the sret transform work; 1.9 needs no codegen
change because HFAs of any size up to v0..v3 stay register-resident.
The test just pins that path with a real, value-bearing IMP so a
future ABI-rule shake-up has a regression net.
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