fix: preserve shadowed for-loop declarators (#11242)

* fix: do not remove for-loop declarators

* fix: do not remove uninitialized var declarators in for init

packages/babel-plugin-transform-parameters/test/fixtures/parameters/let-for-init-same-as-param/exec.js

@@ -0,0 +1,5 @@
+function foo(a = 2) {
+  for (let a = 1; a > 0; a--);
+  expect(a).toBe(2);
+}
+foo();

packages/babel-plugin-transform-parameters/test/fixtures/parameters/let-no-init-for-init-same-as-param/exec.js

@@ -0,0 +1,5 @@
+function foo(a = 2) {
+  for (let a, i = 0; i < 1; i++) a = 1;
+  expect(a).toBe(2);
+}
+foo();

packages/babel-plugin-transform-parameters/test/fixtures/parameters/var-for-body-same-as-param/exec.js

@@ -0,0 +1,5 @@
+function foo(a = 2) {
+  for (var i of [0]) var a = 1;
+  expect(a).toBe(1);
+}
+foo();

packages/babel-plugin-transform-parameters/test/fixtures/parameters/var-for-init-same-as-param/exec.js

@@ -0,0 +1,5 @@
+function foo(a = 2) {
+  for (var [a] of [[1]]);
+  expect(a).toBe(1);
+}
+foo();

packages/babel-plugin-transform-parameters/test/fixtures/parameters/var-no-init-for-body-same-as-param/exec.js

@@ -0,0 +1,5 @@
+function foo(a = 2) {
+  for (var i of [0]) var a;
+  expect(a).toBe(2);
+}
+foo();

packages/babel-plugin-transform-parameters/test/fixtures/parameters/var-no-init-for-init-same-as-param/exec.js

@@ -0,0 +1,5 @@
+function foo(a = 2) {
+  for (var a, i = 0; i < 1; i++);
+  expect(a).toBe(undefined);
+}
+foo();