Capture and Match shouldn't provide method new

(Especially when BUILD will work just fine.)  Otherwise we force
new grammars that have their own attributes to declare their own
new, which should be unnecessary.

src/core/Capture.pm

@@ -3,8 +3,6 @@ my class Capture { # declared in BOOTSTRAP
     #     has @!list;   # positional parameters
     #     has %!hash;   # named parameters
 
-    method new(:@list,:%hash) { self.bless(:@list,:%hash) }
-
     method from-args(|c) { c }
 
     submethod BUILD(:@list, :%hash --> Nil) {

src/core/Match.pm

@@ -444,10 +444,22 @@ my class Match is Capture is Cool does NQPMatchRole {
         }
     }
 
-    submethod new(:$orig,:$from = 0,:$pos,:$made) {
-        my $new := self.'!cursor_init'($orig, :p($pos));
-        nqp::bindattr_i($new, Match, '$!from', $from);  # cannot assign to int in sig
-	$new
+    submethod BUILD(
+	:$orig = '',
+	:$from = 0,
+	:to(:$pos),
+	:ast(:$made),
+	:$shared,
+	:$braid,
+	:$list,
+	:$hash)
+    {
+	# :build tells !cursor_init that it's too late to do a CREATE
+        self.'!cursor_init'($orig, :build, :p($pos), :$shared, :$braid);
+        nqp::bindattr_i(self, Match,   '$!from', $from);
+        nqp::bindattr(  self, Match,   '$!made', $made) if $made.defined;
+        nqp::bindattr(  self, Capture, '@!list', $list) if $list.defined;
+        nqp::bindattr(  self, Capture, '%!hash', $hash) if $hash.defined;
     }
 
     method clone() {