Makefile.in (optabs.o): Add dependency on basic-block.h.
* Makefile.in (optabs.o): Add dependency on basic-block.h.
* basic-block.h (control_flow_insn_p): Fuction was exported.
* cfgbuild.c (control_flow_insn_p): Fuction was made non-static.
* optabs.c (emit_libcall_block): Emit REG_LIBCALL and REG_RETVAL
notes only when the region is contained in a single basic block.