Tape Machine (#30)

Adds a tape machine way of executing the code.
The tape machine is a series of FunctionCall objects, which can either be called one by one, or be used to generate expressions to make up a function.

Reviewed-on: Rubydragon/MetagraphOptimization.jl#30
Co-authored-by: Anton Reinhard <anton.reinhard@proton.me>
Co-committed-by: Anton Reinhard <anton.reinhard@proton.me>

src/utility.jl

@@ -1,3 +1,18 @@
+"""
+    noop()
+
+Function with no arguments, returns nothing, does nothing. Useful for noop [`FunctionCall`](@ref)s.
+"""
+@inline noop() = nothing
+
+"""
+    unpack_identity(x::SVector)
+
+Function taking an `SVector`, returning it unpacked.
+"""
+@inline unpack_identity(x::SVector{1, <:Any}) = x[1]
+@inline unpack_identity(x) = x
+
 """
     bytes_to_human_readable(bytes)
 
@@ -104,6 +119,10 @@ function unroll_symbol_vector(vec::Vector)
     return result
 end
 
+function unroll_symbol_vector(vec::SVector)
+    return unroll_symbol_vector(Vector(vec))
+end
+
 
 
 ####################