Replace O(N) linear scans through `global_funcs[]` and `global_vars[]` with O(log N) tree lookups for global function and variable resolution. **Global functions:** Scripts that use `ExecuteGlobal` to dynamically generate functions (e.g. Visual Pinball's GLF framework generates ~1000 functions at startup) hit pathological O(N) scan behavior on every `GetRef` call and `GetDispID` lookup. With this change, `GetRef` dispatch over 1000 functions drops from 503ms to 58ms (**8.7x**), reaching parity with Windows (62ms). | Benchmark (1000 dynamic functions) | Before | After | Speedup | Windows | |-----------|--------|-------|---------|---------| | GetRef varied x100K | 503 ms | 58 ms | **8.7x** | 62 ms | | GetRef loop x200K | 292 ms | 82 ms | **3.6x** | 125 ms | | GetRef cached x200K | 35 ms | 35 ms | 1.0x | 85 ms | | Direct call x200K | 35 ms | 46 ms | ~1.0x | 31 ms | **Global variables:** Profiling a real-world 75K-line Visual Pinball table script with 3000+ global variables (registered via multiple `ExecuteGlobal` calls) shows `lookup_identifier`'s linear scan over `global_vars[]` consuming ~55% of total CPU time. Compile-time binding (`bind_local`) does not help here because it only resolves variables declared within the same compilation unit, variables from prior `ExecuteGlobal` calls remain unbound at runtime. Depends on !10544 for the fast `vbs_wcsicmp` used in the tree comparators. -- v4: vbscript: Use indexed lookup for global variables. https://gitlab.winehq.org/wine/wine/-/merge_requests/10546