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, 0 insertions, 2 deletions

diff --git a/clang/test/OpenMP/parallel_for_schedule_messages.cpp b/clang/test/OpenMP/parallel_for_schedule_messages.cpp
index dfdd36dddde..5664529956b 100644
--- a/clang/test/OpenMP/parallel_for_schedule_messages.cpp
+++ b/clang/test/OpenMP/parallel_for_schedule_messages.cpp
@@ -50,8 +50,6 @@ T tmain(T argc, S **argv) {
   for (int i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
   #pragma omp parallel for schedule (static, N) // expected-error {{argument to 'schedule' clause must be a strictly positive integer value}}
   for (T i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
-  #pragma omp parallel for schedule (static, argc+argv[0][0]) default(none) // expected-error 2 {{variable 'argv' must have explicitly specified data sharing attributes}} expected-error 2 {{variable 'argc' must have explicitly specified data sharing attributes}} expected-note 4 {{explicit data sharing attribute requested here}}
-  for (T i = ST; i < N; i++) argv[0][i] = argv[0][i] - argv[0][i-ST];
   return argc;
 }