Broad valgrind run

[Torbjörn Granlund]

I tried adding -fsanitize=address to the default options on the system
ivyubu64v1504 (access via shell.gmplib.org as usually).  A 64-bit build
passed all tests, but alas, a 32-bit build fails two tests:

make[4]: Entering directory '/var/tmp/gmp-obj/otmp/tests/mpq'
FAIL: t-get_d
FAIL: reuse


The complaints are the same.  This is likely a real GMP bug.

==7100==ERROR: AddressSanitizer: stack-buffer-overflow on address 0xffba2d0c at pc 0xf70202e5 bp 0xffba2c14 sp 0xffba2c04
WRITE of size 4 at 0xffba2d0c thread T0
    #0 0xf70202e4 in __gmpn_mod_1s_2p_cps (/var/tmp/gmp-obj/otmp/.libs/libgmp.so.10+0xec2e4)
    #1 0xf701f64a in __gmpn_mod_1 (/var/tmp/gmp-obj/otmp/.libs/libgmp.so.10+0xeb64a)
    #2 0xf703e216 in __gmpn_gcd_1 (/var/tmp/gmp-obj/otmp/.libs/libgmp.so.10+0x10a216)

-- 
Torbjörn
Please encrypt, key id 0xC8601622