[flang][cuda] Allow STOP in device context (#120625)

STOP statement is allowed in device procedure

Author: clementval

flang/lib/Semantics/check-cuda.cpp

@@ -350,6 +350,7 @@ template <bool IsCUFKernelDo> class DeviceContextChecker {
   void Check(const parser::ActionStmt &stmt, const parser::CharBlock &source) {
     common::visit(
         common::visitors{
+            [&](const common::Indirection<parser::StopStmt> &) { return; },
             [&](const common::Indirection<parser::PrintStmt> &) {},
             [&](const common::Indirection<parser::WriteStmt> &x) {
               if (x.value().format) { // Formatted write to '*' or '6'

flang/test/Semantics/cuf09.cuf

@@ -49,6 +49,11 @@ module m
     i = threadIdx%x
     a(i) = c(10) ! ok, a is device and c is constant
   end subroutine
+
+  attributes(global) subroutine stoptest()
+    print*,threadIdx%x
+    stop ! ok
+  end subroutine
 end
 
 program main