static-garbage.impure test fails on arm64 with SBCL 2.1.1

[Sébastien Villemot]

Dear SBCL Developers,

The static-garbage.impure test fails on ARM64 with SBCL 2.1.1. Here is the log excerpt from the Debian package build:
// Running static-garbage.impure.lisp in COMPILE evaluator mode
::: Running :PSEUDOSTATIC-GARBAGE
::: UNEXPECTED-FAILURE :PSEUDOSTATIC-GARBAGE due to SIMPLE-ERROR:
        "The assertion
         (< (SB-KERNEL:GENERATION-OF X) SB-VM:+PSEUDO-STATIC-GENERATION+)
         failed with (SB-KERNEL:GENERATION-OF X) = 6."

The full log (build + test) can be seen at:
https://buildd.debian.org/status/fetch.php?pkg=sbcl&arch=arm64&ver=2%3A2.1.1-1&stamp=1612217430&raw=0

[Sébastien Villemot (sebastien-villemot)]

I forgot to mention that the same test passed with SBCL 2.1.0, see:
https://buildd.debian.org/status/fetch.php?pkg=sbcl&arch=arm64&ver=2%3A2.1.0-1&stamp=1609590012&raw=0

[Douglas Katzman (dougk)]

it was passing by dumb luck. I'll checkin the fix shortly, but I want to try some other architectures first