Conv_*: Added R4/R8 support, and dummy support for Conv_Ovf_*.
Localloc: initial implementation.
Conditional branching opcodes: allow different object types to be compared.
Added Int32 to NativeInt stack to local conversion.
Conv_*: added conversion from float types.
Binary opcodes: properly convert NativeInt output values to pointer.
Box: use boxed type (vs input type) as type for stack to local conversion.