bug#16039: repeated emacs crashes (in GC?)

[YAMAMOTO Mitsuharu]

>>>>> On Wed, 04 Dec 2013 09:43:00 +0900, YAMAMOTO Mitsuharu 
>>>>> <mituharu@math.s.chiba-u.ac.jp> said:

>> Having 136 thousand frames during GC is not unheard of.

> (/ 8720000.0 (* 136 1000))
> 64.11764705882354

> If each frame consumes more than 64 bytes, then it will use up
> 8720000B stack space.

FWIW, the default compiler for Xcode 4.0.2 on Mac OS X 10.6 with the
-O2 option seems to consume 64 bytes for each mark_object frame:

  i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)

  _mark_object:
  00000000000008a0      pushq   %rbp
  00000000000008a1      movq    %rsp, %rbp
  00000000000008a4      movq    %rbx, 0xffffffffffffffd8(%rbp)
  00000000000008a8      movq    %r12, 0xffffffffffffffe0(%rbp)
  00000000000008ac      movq    %r13, 0xffffffffffffffe8(%rbp)
  00000000000008b0      movq    %r14, 0xfffffffffffffff0(%rbp)
  00000000000008b4      movq    %r15, 0xfffffffffffffff8(%rbp)
  00000000000008b8      subq    $0x40, %rsp

And the one for Xcode 5.0.2 on OS X 10.9 with -O4 does 24 bytes:

  Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)

  _mark_object:
  0000000000005c70      pushq   %rbp
  0000000000005c71      movq    %rsp, %rbp
  0000000000005c74      pushq   %r15
  0000000000005c76      pushq   %r14
  0000000000005c78      pushq   %r13
  0000000000005c7a      pushq   %r12
  0000000000005c7c      pushq   %rbx
  0000000000005c7d      subq    $0x18, %rsp

                                     YAMAMOTO Mitsuharu
                                mituharu@math.s.chiba-u.ac.jp