[Bug target/38239] [4.9, 5, 6 regression] The function mcount in gmon.o changes register ecx

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38239

--- Comment #4 from Rainer Orth <ro at gcc dot gnu.org> ---
Created attachment 37961
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37961&action=edit
proposed patch for 4.9 branch