perf(minifier): optimize unused expression removal in minimize_if (#27545)

If minimized expression can be removed fold it to `;` without waiting
for next pass or other minifications to clean this code path

eg. folds `if (0) {}` to `;` instead of first folding it to `0;`

crates/oxc_minifier/src/peephole/minimize_if_statement.rs

@@ -20,8 +20,13 @@ impl<'a> PeepholeOptimizations {
                 ctx.replace_statement_with(stmt, |stmt, ctx| {
                     let Statement::IfStatement(if_stmt) = stmt else { unreachable!() };
                     let IfStatement { mut test, span, .. } = if_stmt.unbox();
-                    Self::remove_unused_expression(&mut test, ctx);
-                    Statement::new_expression_statement(span, test, ctx)
+                    if Self::remove_unused_expression(&mut test, ctx) {
+                        // `if (0) {}` => `;`
+                        ctx.drop_expression(&test);
+                        Statement::new_empty_statement(span, ctx)
+                    } else {
+                        Statement::new_expression_statement(span, test, ctx)
+                    }
                 });
                 return;
             }

tasks/track_memory_allocations/allocs_minifier.yaml

@@ -16,7 +16,7 @@ App.tsx:
   sys deallocs: 61
   sys alloc bytes: 2128539 # 2.13 MB
   sys peak growth: 1612427 # 1.61 MB
-  arena allocs: 7727
+  arena allocs: 7726
   arena reallocs: 920
   arena size: 2782336 # 2.78 MB
 
@@ -71,6 +71,6 @@ kitchen-sink.tsx:
   sys deallocs: 1854
   sys alloc bytes: 5304252 # 5.30 MB
   sys peak growth: 3707425 # 3.71 MB
-  arena allocs: 31107
+  arena allocs: 31106
   arena reallocs: 3012
   arena size: 8461040 # 8.46 MB