GCC 8.1 RC1 Bootstrap comparison failure on AIX

[David Edelsohn]

Jakub and Richi,

GCC 8.1 is experiencing the same bootstrap failure with GCC 8.1 RC1 as
we saw previously.

Bootstrap comparison failure!
gcc/function-tests.o differs

And the same reason: unique, static symbol that includes a random timestamp.

1949c1949

< [1936]        m   0x00000060         1     1    0x02         0x0000
   _GLOBAL__F__nasfarm_edelsohn_src_gcc_8.0.1_RC_20180425_gcc_function_tests.c_DFF67DD7_0x4eda2a0ca57bf446
---
> [1936]        m   0x00000060         1     1    0x02         0x0000     _GLOBAL__F__nasfarm_edelsohn_src_gcc_8.0.1_RC_20180425_gcc_function_tests.c_DFF67DD7_0xbe25963bf76153c

The entire file is protected by CHECKING_P. As DEBUG_FUNCTION
propagates to more and more header files, this triggers when building
without checking.

How do you suggest that we try to fix it this time? I'm not certain
that we can pull out the one function this time.  Should we return to
the -frandom-seed patch for self-test files that you proposed last
time?

Thanks, David