[SYCL][NFC] Remove __SYCL_INLINE_VER_NAMESPACE macro (#10510)

Author: bader

clang/lib/Sema/SemaSYCL.cpp

@@ -5184,7 +5184,7 @@ void SYCLIntegrationHeader::emit(raw_ostream &O) {
   O << "\n";
 
   O << "namespace sycl {\n";
-  O << "__SYCL_INLINE_VER_NAMESPACE(_V1) {\n";
+  O << "inline namespace _V1 {\n";
   O << "namespace detail {\n";
 
   // Generate declaration of variable of type __sycl_device_global_registration
@@ -5347,7 +5347,7 @@ void SYCLIntegrationHeader::emit(raw_ostream &O) {
   }
   O << "\n";
   O << "} // namespace detail\n";
-  O << "} // __SYCL_INLINE_VER_NAMESPACE(_V1)\n";
+  O << "} // namespace _V1\n";
   O << "} // namespace sycl\n";
   O << "\n";
 }
@@ -5659,7 +5659,7 @@ bool SYCLIntegrationFooter::emit(raw_ostream &OS) {
     } else {
       EmittedFirstSpecConstant = true;
       OS << "namespace sycl {\n";
-      OS << "__SYCL_INLINE_VER_NAMESPACE(_V1) {\n";
+      OS << "inline namespace _V1 {\n";
       OS << "namespace detail {\n";
       OS << "template<>\n";
       OS << "inline const char *get_spec_constant_symbolic_ID_impl<";
@@ -5677,7 +5677,7 @@ bool SYCLIntegrationFooter::emit(raw_ostream &OS) {
       OS << "\";\n";
       OS << "}\n";
       OS << "} // namespace detail\n";
-      OS << "} // __SYCL_INLINE_VER_NAMESPACE(_V1)\n";
+      OS << "} // namespace _V1\n";
       OS << "} // namespace sycl\n";
     }
   }

clang/test/CodeGenSYCL/Inputs/sycl.hpp

@@ -670,5 +670,5 @@ class image {
   }
 };
 
-} // inline namespace _V1
+} // namespace _V1
 } // namespace sycl

clang/test/CodeGenSYCL/accessor-readonly-invalid-lib.cpp

@@ -71,7 +71,7 @@ class __attribute__((sycl_special_class)) [[__sycl_detail__::sycl_type(accessor)
               range<dimensions> MemRange, id<dimensions> Offset) {}
 };
 
-} // inline namespace _V1
+} // namespace _V1
 } // namespace sycl
 
 template <typename name, typename Func>