* configure.ac (BACKTRACESPEC): Remove definition, but continue to

	AC_SUBST definition from configure.host.
	* configure.host: Don't use -fno-omit-frame-pointer. Set BACKTRACESPEC
	to -fomit-frame-pointer on 32-bit x86 targets.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100469 138bc75d-0d04-0410-961f-82ee72b054a4