use new instead of alloc init

Summary:
i saw this a lot in the codebase, it's not optimal bc we're using two selectors when we only need one.

  fastmod --extensions m,mm '\[\[(.*) alloc] init]' '[${1} new]' --dir xplat/js/react-native-github/*

i manually updated the callsites that this codemod couldn't handle (e.g., where there were more than one of these instances in a single line)

Changelog: [Internal]

Reviewed By: RSNara

Differential Revision: D31776561

fbshipit-source-id: 1b16da240e8a79b54da67383d548921b82b05a9f

Libraries/Text/TextInput/RCTBaseTextInputView.m

@@ -300,7 +300,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
     self.backedTextInputView.inputView = nil;
   } else {
     // Hides keyboard, but keeps blinking cursor.
-    self.backedTextInputView.inputView = [[UIView alloc] init];
+    self.backedTextInputView.inputView = [UIView new];
   }
 }
 
@@ -607,7 +607,7 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithFrame:(CGRect)frame)
   _hasInputAccesoryView = shouldHaveInputAccesoryView;
 
   if (shouldHaveInputAccesoryView) {
-    UIToolbar *toolbarView = [[UIToolbar alloc] init];
+    UIToolbar *toolbarView = [UIToolbar new];
     [toolbarView sizeToFit];
     UIBarButtonItem *flexibleSpace =
       [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace