mesa: don't flush and don't flag _NEW_STENCIL in ClearStencil, ActiveStencilFace

The functions don't affect driver state. There is no code that would rely
on vertices being flushed prior to changing the states, and no code that
would check for _NEW_STENCIL before using the states.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/mesa/main/stencil.c

@@ -109,10 +109,6 @@ _mesa_ClearStencil( GLint s )
 {
    GET_CURRENT_CONTEXT(ctx);
 
-   if (ctx->Stencil.Clear == (GLuint) s)
-      return;
-
-   FLUSH_VERTICES(ctx, _NEW_STENCIL);
    ctx->Stencil.Clear = (GLuint) s;
 }
 
@@ -390,7 +386,6 @@ _mesa_ActiveStencilFaceEXT(GLenum face)
    }
 
    if (face == GL_FRONT || face == GL_BACK) {
-      FLUSH_VERTICES(ctx, _NEW_STENCIL);
       ctx->Stencil.ActiveFace = (face == GL_FRONT) ? 0 : 2;
    }
    else {