A local `array[0..N] of IFoo` stored interface elements but never released
them when the array went out of scope, leaking one obj reference per element
on BOTH backends (the scope-exit ARC sweep had no static-array case).
Both backends now release each interface element of a static-array-of-
interface local at scope teardown, via shared helpers
EmitStaticArrayReleaseElems / EmitManagedReleaseAt (per-backend). The QBE
exception-path cleanup zeroes each released slot so an outer handler's cleanup
stays a no-op.
Scope is restricted to INTERFACE elements on purpose. Static-array-of-
class/string/record locals are NOT released here: the element store retains
unconditionally while owning code manages some such arrays manually (the ELF
writer frees each `RelaBuf: array[0..5] of TByteBuf` element with `.Free`), so
a blanket scope-exit release double-frees and corrupts the allocator — it
crashed the native self-hosted compiler (caught by fixpoint-warmcache.sh).
EmitRecordReleaseFields likewise still skips static-array fields, to stay
symmetric with the retain/copy paths. Both gaps are documented for a later,
symmetric fix.
E2E regression (both backends):
TE2ELeakCheckTests.TestDebug_StaticArrayOfInterface_NoLeak.
4bd52cd96a