Added "opt" lemma and moved OSR to right place

S99-glossary.pod

@@ -971,6 +971,13 @@ object code or library. A latter phase links object code to generate an executab
 For dynamic languages like Perl 6, the equivalent of object code is the L</bytecode> and
 the linking phase is more complex and involves the deL</serialization> of information.
 
+=head2 On Stack Replacement
+
+According to the hotspot L</glossary|http://openjdk.java.net/groups/hotspot/docs/HotSpotGlossary.html> :  The process of converting
+an interpreted (or less optimized) stack frame into a compiled (or more optimized) stack frame.
+
+=head2 our
+
 =head2 OO
 
 Object oriented
@@ -1006,16 +1013,13 @@ L</AST> from the parse subtree
 
         <O('%conditional, :reducecheck<ternary>, :pasttype<if>')>
 
-=head2 OSR
-
-L</On Stack Replacement>
+=head2 opt
 
-=head2 On Stack Replacement
+An optimization, usually in either the context of L</spesh> or L</JIT>.
 
-According to the hotspot L</glossary|http://openjdk.java.net/groups/hotspot/docs/HotSpotGlossary.html> :  The process of converting
-an interpreted (or less optimized) stack frame into a compiled (or more optimized) stack frame.
+=head2 OSR
 
-=head2 our
+L</On Stack Replacement>
 
 =head2 OUR::