QBE 1.3 (released 2026-06-01) adds Windows AMD64 ABI support
(amd64_win target), improved PIC via extern symbol constants,
GVN/GCM optimisation passes, if-conversion, and various
correctness and performance fixes.
All 2293 compiler tests pass against the new QBE binary.
Fix TProgram.Uses reserved-word clash (renamed to UsedUnits), nested
brace-comment in uParser.pas, and missing uAST in Blaise.pas uses clause.
Vendor QBE 1.2 source in vendor/qbe/ (built locally with make; binary
excluded via .gitignore). End-to-end pipeline confirmed: Blaise compiles
Hello World and Calc (6*7=42) to native x86_64 Linux binaries.
71/71 FPCUnit tests passing.
