[COMMITTED] ada: Enable Support_Atomic_Primitives on QNX and RTEMS

[Marc Poulhiès via Gcc-patches]

From: Patrick Bernardi <berna...@adacore.com>

QNX and RTEMS support 64-bit atomic primitives.

gcc/ada/

        * libgnat/system-qnx-arm.ads: Set Support_Atomic_Primitives to
        True.
        * libgnat/system-rtems.ads: Add Support_Atomic_Primitives.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/libgnat/system-qnx-arm.ads | 2 +-
 gcc/ada/libgnat/system-rtems.ads   | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/libgnat/system-qnx-arm.ads 
b/gcc/ada/libgnat/system-qnx-arm.ads
index 038fe6c9230..749384f9fd1 100644
--- a/gcc/ada/libgnat/system-qnx-arm.ads
+++ b/gcc/ada/libgnat/system-qnx-arm.ads
@@ -142,7 +142,7 @@ private
    Stack_Check_Probes        : constant Boolean := True;
    Stack_Check_Limits        : constant Boolean := False;
    Support_Aggregates        : constant Boolean := True;
-   Support_Atomic_Primitives : constant Boolean := False;
+   Support_Atomic_Primitives : constant Boolean := True;
    Support_Composite_Assign  : constant Boolean := True;
    Support_Composite_Compare : constant Boolean := True;
    Support_Long_Shifts       : constant Boolean := True;
diff --git a/gcc/ada/libgnat/system-rtems.ads b/gcc/ada/libgnat/system-rtems.ads
index 5959b72405b..52ee299c260 100644
--- a/gcc/ada/libgnat/system-rtems.ads
+++ b/gcc/ada/libgnat/system-rtems.ads
@@ -150,6 +150,7 @@ private
    Stack_Check_Probes        : constant Boolean := False;
    Stack_Check_Limits        : constant Boolean := False;
    Support_Aggregates        : constant Boolean := True;
+   Support_Atomic_Primitives : constant Boolean := True;
    Support_Composite_Assign  : constant Boolean := True;
    Support_Composite_Compare : constant Boolean := True;
    Support_Long_Shifts       : constant Boolean := True;
-- 
2.34.1