* Mark arith011 as broken with integer-simple
As noted in #16091, arith011 fails when run against integer-simple with a
"divide by zero" exception. This suggests that integer-gmp and integer-simple
are handling division by zero differently.
* This also fixes broken_without_gmp; the lack of types made the previous
failure silent, sadly. Improves situation of #16043.
* Mark several tests implicitly depending upon integer-gmp as broken
with integer-simple. These expect to see Core coming from integer-gmp,
which breaks with integer-simple.
* Increase runtime timeout multiplier of T11627a with integer-simple
I previously saw that T11627a timed out in all profiling ways when run against
integer-simple. I suspect this is due to integer-simple's rather verbose heap
representation. Let's see whether increasing the runtime timeout helps.
Fixes test for #11627.
This is all in service of fixing #16043.