D3D11: Fix ClearBufferiv with STENCIL.

For some reason we were using the second GLint value passed into the
method, when the spec says we should have a single clear value.

Noticed when adding tests for lazy robust resource init (tests will
be added in a subsequent patch).

BUG=angleproject:2107

Change-Id: Iadfc5072796255072bfb71ff1918253045e29576
Reviewed-on: https://chromium-review.googlesource.com/675049
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Frank Henigman <fjhenigman@chromium.org>
diff --git a/src/libANGLE/renderer/d3d/FramebufferD3D.cpp b/src/libANGLE/renderer/d3d/FramebufferD3D.cpp
index dd17686..0d1a38e 100644
--- a/src/libANGLE/renderer/d3d/FramebufferD3D.cpp
+++ b/src/libANGLE/renderer/d3d/FramebufferD3D.cpp
@@ -167,7 +167,7 @@
     if (buffer == GL_STENCIL)
     {
         clearParams.clearStencil = true;
-        clearParams.stencilValue = values[1];
+        clearParams.stencilValue = values[0];
     }
 
     return clearImpl(context, clearParams);