hoisted up some common subexpressions and reduced a lot of string indexing. Also changed an x<<1 to x*2, because really that is our intent. Let the compiler do what it does best.
hoisted up some common subexpressions and reduced a lot of string indexing. Also changed an x<<1 to x*2, because really that is our intent. Let the compiler do what it does best.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@39946 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot