[flang][cuda] Add missing bind name for __int2double_rn (#153720)

Author: clementval

flang/module/cudadevice.f90

@@ -738,7 +738,7 @@ attributes(device) real(8) function sinpi(x) bind(c,name='__nv_sinpi')
   end interface
 
   interface __int2double_rn
-    attributes(device) double precision function __int2double_rn(i) bind(c)
+    attributes(device) double precision function __int2double_rn(i) bind(c, name='__nv_int2double_rn')
       !dir$ ignore_tkr (d) i
       integer, value :: i
     end function

flang/test/Lower/CUDA/cuda-libdevice.cuf

@@ -245,6 +245,15 @@ end subroutine
 ! CHECK: %{{.*}} = fir.call @__nv_float2uint_ru(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (f32) -> i32
 ! CHECK: %{{.*}} = fir.call @__nv_float2uint_rz(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (f32) -> i32
 
+attributes(global) subroutine test_int2double_rn()
+  double precision :: res
+  integer :: r
+  res = __int2double_rn(r)
+end subroutine
+
+! CHECK-LABEL: _QPtest_int2double_rn
+! CHECK: %{{.*}} = fir.call @__nv_int2double_rn(%{{.*}}) proc_attrs<bind_c> fastmath<contract> : (i32) -> f64
+
 attributes(global) subroutine test_fdividef()
   real :: res
   real :: r