Improve type stability of more functions for JET (#2911)

Author: odow

src/FileFormats/MOF/read.jl

@@ -393,15 +393,12 @@ end
 
 function function_to_moi(
     ::Val{:VectorOfVariables},
-    ::Type{T},
+    ::Type,
     object::Dict,
     name_map::Dict{String,MOI.VariableIndex},
-) where {T}
-    return MOI.VectorOfVariables(
-        MOI.VariableIndex[
-            name_map[variable] for variable::String in object["variables"]
-        ],
-    )
+)
+    variables = [name_map[variable::String] for variable in object["variables"]]
+    return MOI.VectorOfVariables(variables)
 end
 
 function function_to_moi(