add support for 7.1 ios SDK
Merge pull request #251 from joshuawarner32/ios-7.1

add support for 7.1 ios SDK
introduce ir::Type and begin migrating i2f and friends to it
use ir::Type in place of lir::ValueType in Value
use ir::Type in Compiler::return_
use ir::Type in Compiler::push
remove unused Compiler::push method
use ir::Type in Compiler::save
use ir::Type in Compiler::pop
use ir::Type in Compiler::initLocal
use ir::Type in place of Compiler::OperandType
reformat
use ir::Type in f2i and friends, instead of aSize
use ir::Type in Compiler::unaryOp and Compiler::binaryOp
change Compiler::register_ to Compiler::threadRegister, since it was only used as such
use ir::Type in Compiler::store
add flavor type check to Compiler::store
add extra flavor type check to Compiler::store
add extra type checks to Compiler::store and Compiler::memory
remove redundant Compiler::memory scale parameter