analysis: add bump-dump scope to loop analysis

src/analysis.zig

@@ -432,10 +432,13 @@ pub const Analyzer = struct {
                     try self.expectSymUnTypeEnum(expr, .Bool);
                 }
 
-                // TODO bump-dump scope
+                try ctx.bumpScope("loop");
+
                 for (loop.then_branch.toSlice()) |then_stmt| {
                     try self.stmtPass(ctx, then_stmt);
                 }
+
+                ctx.dumpScope();
             },
 
             // For (creates 1 scope) receives arrays, which we dont have yet