Unstructured control flow caused by excpetion handling leads to a wrong x87 stack
  state. This patch is to reset the x87 state at the hanlder entry point.

  Thanks for help from weiliang.lin@intel.com.

BUG=

Review URL: https://codereview.chromium.org/1668463006

Cr-Commit-Position: refs/heads/master@{#33738}