Revert "[flang][cuda] Use a reference for asyncObject (#138010)" (#138082)

This reverts commit 9b0eaf7.

Author: clementval

flang-rt/include/flang-rt/runtime/allocator-registry.h

@@ -19,7 +19,7 @@
 
 namespace Fortran::runtime {
 
-using AllocFct = void *(*)(std::size_t, std::int64_t *);
+using AllocFct = void *(*)(std::size_t, std::int64_t);
 using FreeFct = void (*)(void *);
 
 typedef struct Allocator_t {
@@ -28,7 +28,7 @@ typedef struct Allocator_t {
 } Allocator_t;
 
 static RT_API_ATTRS void *MallocWrapper(
-    std::size_t size, [[maybe_unused]] std::int64_t *) {
+    std::size_t size, [[maybe_unused]] std::int64_t) {
   return std::malloc(size);
 }
 #ifdef RT_DEVICE_COMPILATION

flang-rt/include/flang-rt/runtime/descriptor.h

@@ -29,8 +29,8 @@
 #include <cstdio>
 #include <cstring>
 
-/// Value used for asyncObject when no specific stream is specified.
-static constexpr std::int64_t *kNoAsyncObject = nullptr;
+/// Value used for asyncId when no specific stream is specified.
+static constexpr std::int64_t kNoAsyncId = -1;
 
 namespace Fortran::runtime {
 
@@ -372,7 +372,7 @@ class Descriptor {
   // before calling.  It (re)computes the byte strides after
   // allocation.  Does not allocate automatic components or
   // perform default component initialization.
-  RT_API_ATTRS int Allocate(std::int64_t *asyncObject);
+  RT_API_ATTRS int Allocate(std::int64_t asyncId);
   RT_API_ATTRS void SetByteStrides();
 
   // Deallocates storage; does not call FINAL subroutines or