[Bug target/55019] Incorrectly use live argument register to save high register in thumb1 prologue

[terry.guo at arm dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55019

--- Comment #2 from Terry Guo <terry.guo at arm dot com> 2012-10-22 11:23:16 UTC ---
Created attachment 28505
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28505
case to reproduce this bug