i965: Enable IF statements in the VS.

While the actual IF instructions were fixed by Zhenyu, we were still
flattening them to conditional moves.

src/mesa/drivers/dri/i965/brw_context.c

@@ -122,9 +122,6 @@ GLboolean brwCreateContext( int api,
 	 (i == MESA_SHADER_FRAGMENT);
       ctx->ShaderCompilerOptions[i].EmitNoIndirectTemp =
 	 (i == MESA_SHADER_FRAGMENT);
-
-      if (intel->gen == 6)
-	 ctx->ShaderCompilerOptions[i].EmitNoIfs = (i == MESA_SHADER_VERTEX);
    }
 
    ctx->Const.VertexProgram.MaxNativeInstructions = (16 * 1024);