Document top-level pseudo-hygiene

* doc/ref/api-macros.texi (Hygiene and the Top-Level): Add a section
  documenting our pseudo-hygienic top-level names.
Add NEWS for Guile 2.2

* NEWS: Update for 2.1.1.
More precise stack marking via .guile.frame-maps section

* module/language/cps/slot-allocation.scm (lookup-dead-slot-map)
  (allocate-slots): For each non-tail call in a function, compute the
  set of slots that are dead after the function has begun the call.

* module/language/cps/compile-bytecode.scm (compile-fun): Emit the
  `dead-slot-map' macro instruction for non-tail calls.

* module/system/vm/assembler.scm (<asm>): Add `dead-slot-maps' member.
  (dead-slot-map): New macro-instruction.
  (link-frame-maps, link-dynamic-section, link-objects): Write dead
  slots information into .guile.frame-maps sections of ELF files.
* module/system/vm/elf.scm (DT_GUILE_FRAME_MAPS): New definition.

* libguile/loader.h:
* libguile/loader.c (DT_GUILE_FRAME_MAPS, process_dynamic_segment):
  (load_thunk_from_memory, register_elf): Arrange to parse
  DT_GUILE_FRAME_MAPS out of the dynamic section.
  (find_mapped_elf_image_unlocked, find_mapped_elf_image): New helpers.
  (scm_find_mapped_elf_image): Refactor.
  (scm_find_dead_slot_map_unlocked): New interface.

* libguile/vm.c (scm_i_vm_mark_stack): Mark the hottest frame
  conservatively, as before.  Otherwise use the dead slots map, if
  available, to avoid marking data that isn't live.
Fix tracing

* module/system/vm/trace.scm (print-return): Remove frame argument.
  (trace-calls-to-procedure, trace-calls-in-procedure): Adapt callers.
* module/system/vm/traps.scm (trap-in-procedure, trap-frame-finish):
  (trap-calls-to-procedure): Since the pop continuation hook is now
  called after the continuation is popped, we need to check the right
  frame.  Fixes tail-calls in the trace root, and probably other things.
Unnecessary VM_HANDLE_INTERRUPTS elision

* libguile/vm-engine.c: Remove VM_HANDLE_INTERRUPTS before entering a
  subr or foreign call.  The bytecode stub will have already done so
  when entering the stub, and the return sequence handles doing so
  before returning.
Minor for-each speedup

* module/ice-9/boot-9.scm (for-each): Minor speedup by unrolling
  tortoise/hare loop.