Revert "[OPENMP]Fix PR41767: diagnose DSA for variables in clauses with default(none)."

This implementation isn't sound as per the standard.
It erroneously diagnoses e.g. the following case:
```
$ cat test.cpp
void f(int n) {
 #pragma omp parallel default(none) if(n)
    ;
}
```
```
$ ./bin/clang -fopenmp test.cpp
test.cpp:2:40: error: variable 'n' must have explicitly specified data sharing attributes
 #pragma omp parallel default(none) if(n)
                                       ^
test.cpp:2:31: note: explicit data sharing attribute requested here
 #pragma omp parallel default(none) if(n)
                              ^
1 error generated.
```

As per OpenMP Application Programming Interface Version 5.0 November 2018:
* 2.19.4.1default Clause
  The default clause explicitly determines the data-sharing attributes of
  variables that are referenced *in a parallel, teams, or task generating
  construct and would otherwise be implicitly determined
  (see Section 2.19.1.1 on page 270).
* 2.6.1 Determining the Number of Threads for a parallel Region
  Using a variable in an if or num_threads clause expression of a parallel
  construct causes an implicit reference to the variable in all enclosing
  constructs. The if clause expression and the num_threads clause expression
  are evaluated in the context outside of the parallel construct,

This reverts commit r360073.

llvm-svn: 360326

1 files changed, 2 insertions, 2 deletions

diff --git a/clang/test/OpenMP/target_parallel_for_ast_print.cpp b/clang/test/OpenMP/target_parallel_for_ast_print.cpp
index 80c20baca0b..5e22ef3dd8e 100644
--- a/clang/test/OpenMP/target_parallel_for_ast_print.cpp
+++ b/clang/test/OpenMP/target_parallel_for_ast_print.cpp
@@ -176,8 +176,8 @@ int main(int argc, char **argv) {
 // CHECK: static int a;
   static float g;
 #pragma omp threadprivate(g)
-#pragma omp target parallel for schedule(guided, argc) default(none) linear(a) shared(argc)
-  // CHECK: #pragma omp target parallel for schedule(guided, argc) default(none) linear(a) shared(argc)
+#pragma omp target parallel for schedule(guided, argc) default(none) linear(a)
+  // CHECK: #pragma omp target parallel for schedule(guided, argc) default(none) linear(a)
   for (int i = 0; i < 2; ++i)
     a = 2;
 // CHECK-NEXT: for (int i = 0; i < 2; ++i)