update_cpu_features: bump branch quota for amdgcn

/lib/std/Target/amdgcn.zig:1656:5: error: evaluation exceeded 1000 backwards branches
        for (&result, 0..) |*elem, i| {
        ^~~
94f95fefe3Alex Rønne Petersen committed on 8/30/2025, 4:36:41 AMparent5739ce7
1 file changedLine totals unavailable