[AMDGPU] gfx1010 clang target

Differential Revision: https://reviews.llvm.org/D61875

llvm-svn: 360634
diff --git a/clang/docs/ClangCommandLineReference.rst b/clang/docs/ClangCommandLineReference.rst
index f153a0c..5ec947a 100644
--- a/clang/docs/ClangCommandLineReference.rst
+++ b/clang/docs/ClangCommandLineReference.rst
@@ -2396,6 +2396,11 @@
 
 AMDGPU
 ------
+.. option:: -mcumode, -mno-cumode
+
+CU wavefront execution mode is used if enabled and WGP wavefront execution mode
+is used if disabled (AMDGPU only)
+
 .. option:: -mxnack, -mno-xnack
 
 Enable XNACK (AMDGPU only)