Remove allocation and elide a test that is no longer relevant

Author: jacob-shops

zjit/src/hir.rs

@@ -6158,7 +6158,8 @@ impl Function {
             changed = false;
 
             for (row, block) in param_values.iter_mut().zip(&self.blocks) {
-                *row = vec![ParamValue::None; block.params.len()];
+                row.clear();
+                row.resize(block.params.len(), ParamValue::None);
             }
 
             // Scan through each jump, collecting edges with params to analyze from CondBranch and Jump insns.

zjit/src/hir/opt_tests.rs

@@ -19235,27 +19235,6 @@ mod hir_opt_tests {
         ");
     }
 
-    #[test]
-    fn test_dedup_guard_type_across_cfg_join() {
-        eval("
-            def test(n, cond)
-              if cond
-                a = n + 1
-              else
-                a = n + 2
-              end
-              n + a
-            end
-            test(1, true); test(1, false)
-        ");
-        let hir = hir_string("test");
-        let guard_count = hir.matches("GuardType").count();
-        assert_eq!(
-            guard_count, 2,
-            "expected 2 GuardType instructions after cross-block dedup, found {guard_count}\n\nHIR:\n{hir}"
-        );
-    }
-
     #[test]
     fn test_forward_guard_through_conditional_branch() {
         eval("