[clang][Interp][NFC] Unifty ReadArg() impl in Disasm.cpp

We can use another if constexpr here to make this shorter and easier to
understand.

diff --git a/clang/lib/AST/Interp/Disasm.cpp b/clang/lib/AST/Interp/Disasm.cpp
index 82cc849..67cc248 100644 (file)
--- a/clang/lib/AST/Interp/Disasm.cpp
+++ b/clang/lib/AST/Interp/Disasm.cpp
@@ -21,17 +21,13 @@
 using namespace clang;
 using namespace clang::interp;
 
-template <typename T>
-inline std::enable_if_t<!std::is_pointer<T>::value, T> ReadArg(Program &P,
-                                                               CodePtr &OpPC) {
-  return OpPC.read<T>();
-}
-
-template <typename T>
-inline std::enable_if_t<std::is_pointer<T>::value, T> ReadArg(Program &P,
-                                                              CodePtr &OpPC) {
-  uint32_t ID = OpPC.read<uint32_t>();
-  return reinterpret_cast<T>(P.getNativePointer(ID));
+template <typename T> inline T ReadArg(Program &P, CodePtr &OpPC) {
+  if constexpr (std::is_pointer<T>::value) {
+    uint32_t ID = OpPC.read<uint32_t>();
+    return reinterpret_cast<T>(P.getNativePointer(ID));
+  } else {
+    return OpPC.read<T>();
+  }
 }
 
 LLVM_DUMP_METHOD void Function::dump() const { dump(llvm::errs()); }