gl_rasterizer: Add texture fetch barrier for fragments

Fixes flicker seen in XC2

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -437,7 +437,7 @@ void RasterizerOpenGL::WaitForIdle() {
 }
 
 void RasterizerOpenGL::FragmentBarrier() {
-    glMemoryBarrier(GL_FRAMEBUFFER_BARRIER_BIT);
+    glMemoryBarrier(GL_FRAMEBUFFER_BARRIER_BIT | GL_TEXTURE_FETCH_BARRIER_BIT);
 }
 
 void RasterizerOpenGL::TiledCacheBarrier() {