[committed][nvptx] Add mexperimental

[committed][nvptx] Add mexperimental

[Tom de Vries]

Hi,

Add new option -mexperimental.

This allows, rather than developing a new feature to completion in a
development branch, to develop a new feature on trunk, without disturbing
trunk.

The equivalent of the feature branch merge then becomes making the
functionality available for -mno-experimental.

If more features at the same time will be developed, we can do something like
-mexperimental=feature1,feature2 but for now that's not necessary.

For now, has no effect.

Committed to trunk.

Thanks,
- Tom

[nvptx] Add mexperimental

gcc/ChangeLog:

2022-03-19  Tom de Vries  <tdevries@suse.de>

	* config/nvptx/nvptx.opt (mexperimental): New option.

---
 gcc/config/nvptx/nvptx.opt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/config/nvptx/nvptx.opt b/gcc/config/nvptx/nvptx.opt
index 980428b58cc..11288d1a8ee 100644
--- a/gcc/config/nvptx/nvptx.opt
+++ b/gcc/config/nvptx/nvptx.opt
@@ -88,3 +88,6 @@ Target Var(nvptx_comment) Init(1) Undocumented
 
 malias
 Target Var(nvptx_alias) Init(0) Undocumented
+
+mexperimental
+Target Var(nvptx_experimental) Init(0) Undocumented