Disable optimization on _swrast_write_zoomed_stencil_span

src/mesa/swrast/s_zoom.c

 /*
  * Mesa 3-D graphics library
  * Version:  7.1
  *
  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
@@ skipping 377 matching lines @@
    }
 
    /* write the zoomed spans */
    for (y = y0; y < y1; y++) {
       _swrast_write_stencil_span(ctx, zoomedWidth, x0, y, zoomedVals);
    }
 
    free(zoomedVals);
 }
 
+// http://crbug.com/348397
+#ifdef _MSC_VER
+#pragma optimize("", off)
+#endif
 
 /**
  * Zoom/write 32-bit Z values.
  * No per-fragment operations are applied.
  */
 void
 _swrast_write_zoomed_z_span(struct gl_context *ctx, GLint imgX, GLint imgY,
                             GLint width, GLint spanX, GLint spanY,
                             const GLuint *zVals)
 {
@@ skipping 25 matching lines @@
    }
 
    /* write the zoomed spans */
    for (y = y0; y < y1; y++) {
       GLubyte *dst = _swrast_pixel_address(rb, x0, y);
       _mesa_pack_uint_z_row(rb->Format, zoomedWidth, zoomedVals, dst);
    }
 
    free(zoomedVals);
 }
+
+#ifdef _MSC_VER
+#pragma optimize("", off)
+#endif