introduce halide2isl::ParameterVector shorthand

This emphasizes that the two fields of this type represent
the same type of object and it will be reused in the next commit.

Author: Sven Verdoolaege

tc/core/halide2isl.h

@@ -33,10 +33,11 @@ namespace halide2isl {
 /// Helper functions that participate in translating Halide IR to ISL
 ///
 
+using ParameterVector = std::vector<Halide::Internal::Parameter>;
 /// Find and categorize all variables referenced in a piece of Halide IR
 struct SymbolTable {
   std::vector<std::string> reductionVars, idxVars;
-  std::vector<Halide::Internal::Parameter> params;
+  ParameterVector params;
 };
 SymbolTable makeSymbolTable(const tc2halide::HalideComponents& components);
 

tc/core/polyhedral/scop.h

@@ -472,7 +472,7 @@ struct Scop {
  public:
   // Halide stuff
   struct {
-    std::vector<Halide::Internal::Parameter> params;
+    halide2isl::ParameterVector params;
     std::vector<std::string> idx, reductionIdx;
     std::vector<Halide::ImageParam> inputs;
     std::vector<Halide::OutputImageParam> outputs;