Extend set of <enum> from a 64-member cap to 256, Java-EnumSet style. Sets
of 64 members or fewer keep the existing single-register bitmask (QBE w/l);
sets of 65..256 members ('jumbo') become an inline byte-array bitmap of
ceil(N/8) bytes, treated as a value aggregate (passed by reference, returned
via sret, memset/memcpy), with operations performed by new RTL helpers.
Representation (uSymbolTable): TSetTypeDesc.IsJumbo (BitCount > 64) and
RawByteSize; RawSize/ByteSize/AllocAlign sized accordingly. TSymbol gains
ConstSetBytes/ConstSetQbe for jumbo constants (can't fit an Int64 mask).
RTL: new runtime/src/main/pascal/blaise_set.pas — _SetIn/_SetInclude/
_SetExclude/_SetUnion/_SetInter/_SetDiff/_SetEqual/_SetCopy over byte-array
bitmaps (overlap-safe). Wired into runtime/Makefile.
Semantic: the four >64 caps become >256. AnalyseSetConstDecl folds a jumbo
const to a byte array. The anonymous set for 'X in [a,b,c]' is sized to the
largest listed ordinal (when constant), not the full enum — keeping the
common low-ordinal membership test (incl. the compiler's own TokenKind
tests) on the fast register path. This also fixes a latent miscompile: the
old fixed-l representation silently dropped any listed ordinal >= 64.
Codegen (both backends): jumbo branches for literal, in, +/-/*, =/<>,
Include/Exclude, for-in, assignment, params (pmJumboSetValue ABI), and sret
returns. The register 'in' gained a range guard for literal-sized sets.
Native reserves two 32-byte scratch slots per frame (and .bss in main) for
set-op/literal result buffers. QBE adds IsAggregateAddrType so jumbo sets
ride the record/static-array address paths and are never promoted.
OPDF: no format change — recSet SizeInBytes (1 byte) already covers <=32.
Verified: FIXPOINT_OK and NATIVE_FIXPOINT_OK; full suite (3172 tests) green
built by the stage-2 binary, the QBE fixpoint binary, and the native
fixpoint binary; bif-coverage OK. Tests: cp.test.jumboset (12 IR) and
cp.test.e2e.jumboset (6 e2e, both backends via AssertRunsOnAll); the
>256-member rejection test in cp.test.sets updated. Docs: grammar.ebnf and
language-rationale set-type sections updated for the 256 cap and literal
sizing.
Closes the design discussion behind #81.
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