Implement Tail Call Optimization for function calls

[alexdovzhanyn]

WebAssembly has support for tail call recursion optimization with the return_call and return_call_indirect instructions as mentioned in the TCO proposal and the MDN Docs.

In Theta, we currently do not make use of this instruction and only rely on the call_indirect for our function calls. We need to update the codegen for function calls to detect when we can use the return_call_indirect and make appropriate use of it.