[llvm] Remove argument_type in std::hash specializations (NFC) (#165167)

The argument_type and result_type type aliases in std::hash are
deprecated in C++17 and removed in C++20.  This patch aligns two
specializations of ours with the C++ standard.

1 files changed, 1 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
index 93ae548..7bef3a8 100644
--- a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
+++ b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
@@ -86,10 +86,7 @@ template <> struct llvm::DenseMapInfo<VariableID> {
 using VarLocInsertPt = PointerUnion<const Instruction *, const DbgRecord *>;
 
 template <> struct std::hash<VarLocInsertPt> {
-  using argument_type = VarLocInsertPt;
-  using result_type = std::size_t;
-
-  result_type operator()(const argument_type &Arg) const {
+  std::size_t operator()(const VarLocInsertPt &Arg) const {
     return std::hash<void *>()(Arg.getOpaqueValue());
   }
 };