Two more leaf-level code-gen cleanups now that the const folder is in.
- UnaryExpr MINUS over a LITERAL (INT/DOUBLE) emits the negated value
directly, so `-42` becomes PushInt(-42) instead of PushInt(42) +
Negate(). Guarded: MinInt64 passes through to the VM so the
coerce-to-double path stays authoritative. Variables fall through
to the normal Negate path — the LiteralExpr type assertion is the
gate, so runtime-typed `-x` keeps its semantics.
- `x := x + <expr>` / `x := x - <expr>` detected when the LHS ident
resolves to the same local as the self-reference on the RHS,
emits the same LocalAdd / Negate+LocalAdd shape that x += y already
used. Non-matching locals (shadowing, module statics) fall through.
Verification
- go test ./... ALL PASS
- FiveSql2 test_sql1999 43/43
- tests/compat_harbour 56/56
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
CharlesKWON
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