[cleanup] Remove duplicate getter in Signature class

R=tebbi@chromium.org

Bug: v8:7793, v8:8562
Change-Id: I783a6d76edd20b73b25cc81395ecadbedd346e8b
Reviewed-on: https://chromium-review.googlesource.com/c/1447775Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59239}

src/torque/types.cc

@@ -339,8 +339,8 @@ std::ostream& operator<<(std::ostream& os, const ParameterTypes& p) {
 
 bool Signature::HasSameTypesAs(const Signature& other,
                                ParameterMode mode) const {
-  auto compare_types = GetTypes();
-  auto other_compare_types = other.GetTypes();
+  auto compare_types = types();
+  auto other_compare_types = other.types();
   if (mode == ParameterMode::kIgnoreImplicit) {
     compare_types = GetExplicitTypes();
     other_compare_types = other.GetExplicitTypes();

src/torque/types.h

@@ -583,7 +583,6 @@ struct Signature {
   bool HasSameTypesAs(
       const Signature& other,
       ParameterMode mode = ParameterMode::kProcessImplicit) const;
-  const TypeVector& GetTypes() const { return parameter_types.types; }
   TypeVector GetImplicitTypes() const {
     return TypeVector(parameter_types.types.begin(),
                       parameter_types.types.begin() + implicit_count);