Patches to improve Time.parse performance.

gistfile1.diff

diff --git a/core/src/main/java/org/jruby/RubyHash.java b/core/src/main/java/org/jruby/RubyHash.java
index 661d394..9dadce6 100644
--- a/core/src/main/java/org/jruby/RubyHash.java
+++ b/core/src/main/java/org/jruby/RubyHash.java
@@ -1624,7 +1624,13 @@ public class RubyHash extends RubyObject implements Map {
         iteratorVisitAll(new Visitor() {
             @Override
             public void visit(IRubyObject key, IRubyObject value) {
-                if (block.yieldArray(context, RubyArray.newArray(runtime, key, value), null, null).isTrue()) {
+                IRubyObject ret;
+                if (block.arity().getValue() == 2) {
+                    ret = block.yieldSpecific(context, key, value);
+                } else {
+                    ret = block.yieldArray(context, RubyArray.newArray(runtime, key, value), null, null);
+                }
+                if (ret.isTrue()) {
                     self.delete(context, key, Block.NULL_BLOCK);
                 }
             }
diff --git a/lib/ruby/2.1/date/format.rb b/lib/ruby/2.1/date/format.rb
index 39c9137..30f547c 100644
--- a/lib/ruby/2.1/date/format.rb
+++ b/lib/ruby/2.1/date/format.rb
@@ -120,10 +120,17 @@ class Date
         set = t.chomp!('=')
         t = t.intern
         if set
-          @elem[t] = args[0]
+          ret = @elem[t] = args[0]
         else
-          @elem[t]
+          ret = @elem[t]
         end
+
+        self.class.class_eval <<-EOF
+          def #{t}; @elem[:#{t}]; end
+          def #{t}=(x); @elem[:#{t}]=x; end
+        EOF
+
+        ret
       end
 
       def to_hash