Reintroduce stack frame construction with /Oy- (removal was implied by /O2).
  This makes binaries far easier to debug, during operation and for post-crash
  .dmp analysis.  Do not alter /Gs optimizations per brane.

Reviewed by: stoddard, brane

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@170253 13f79535-47bb-0310-9956-ffa450edef68