stylistic exception updates

no functional changes

src/core/CallFrame.pm

@@ -48,7 +48,7 @@ my class CallFrame {
     }
 
     method callframe(Int $level = 0) {
-        die X::NYI.new(feature => 'Callframe.callframe');
+        X::NYI.new(feature => 'Callframe.callframe').throw;
     }
 }
 

src/core/Hash.pm

@@ -46,7 +46,7 @@ my class Hash {
             }
             elsif $items { self.STORE_AT_KEY($x, $items.shift) }
             else {
-                die(X::Hash::Store::OddNumber.new())
+                X::Hash::Store::OddNumber.new.throw
             }
         }
         self

src/core/operators.pm

@@ -21,19 +21,18 @@ multi infix:<does>(Mu:D \$obj, Mu:U \$rolish, :$value! is parcel) is rw {
                 $rolish.HOW.archetypes.composalizable() ?? $rolish.HOW.composalize($rolish) !!
                 die("Cannot mix in a non-composable type");
     my @attrs = $role.^attributes().grep: { .has_accessor };
-    die(X::Role::Initialization.new())
-        unless @attrs == 1;
+    X::Role::Initialization.new().throw unless @attrs == 1;
     $obj.HOW.mixin($obj, $role).BUILD_LEAST_DERIVED({ @attrs[0].Str.substr(2) => $value });
 }
 multi infix:<does>(Mu:U \$obj, Mu:U \$role) is rw {
-    die(X::Does::TypeObject.new())
+    X::Does::TypeObject.new().throw
 }
 multi infix:<does>(Mu:D \$obj, @roles) is rw {
     # XXX Mutability check.
     $obj.HOW.mixin($obj, |@roles).BUILD_LEAST_DERIVED({});
 }
 multi infix:<does>(Mu:U \$obj, @roles) is rw {
-    die(X::Does::TypeObject.new())
+    X::Does::TypeObject.new().throw
 }
 
 proto infix:<but>(|$) { * }