[flang] [clang] [llvm] [libc] [lld] [libcxx] [clang-tools-extra] [lldb] [OpenACC] Initial commits to support OpenACC (PR #70234)

[Bruno Cardoso Lopes via cfe-commits]

================
@@ -0,0 +1,14 @@
+// RUN: %clang -S -### -fopenacc %s 2>&1 | FileCheck %s --check-prefix=CHECK-DRIVER
+// CHECK-DRIVER: "-cc1" {{.*}} "-fopenacc"
----------------
bcardosolopes wrote:

How does the interaction between using both `-fopenmp` and `-fopenacc` at the same time should look like? One takes precedence? Or should it be rejected?

https://github.com/llvm/llvm-project/pull/70234