src/code/debug-int: commented out float related code
compiler/arm/vm: added SINGLE-VALUE-RETURN-BYTE-OFFSET to make code/debug-int compile
added dummy code to make code/debug-int compile

* added FUN-END-BREAKPOINT-TRAP, SINGLE-STEP-AROUND-TRAP, and
  SINGLE-STEP-BEFORE-TRAP to compiler/arm/parms

* added symbols FUN_END_BREAKPOINT_GUTS, FUN_END_BREAKPOINT_TRAP, AND
  FUN_END_BREAKPOINT_TRAP to runtime/arm-assem.S

* uncommented declaration of ARCH_HANDLE_SINGLE_STEP_TRAP, though left
  it empty