Bug 1585688 - Make test work when configured for 256KB chunks r=jonco

This test sets the minimum nursery size to 16MB. But on some configurations
the nursery's maximum is 4MB (16 * 256KB chunks, eg on mobile). Setting the
minimum greater than the maximum is forbidden. This patch sets the maximum
and minimum nursery sizes in the test to avoid this problem.

Differential Revision: https://phabricator.services.mozilla.com/D48288

--HG--
extra : moz-landing-system : lando

js/src/jit-test/tests/gc/bug-1543589.js

@@ -2,6 +2,7 @@
 // This test times out in ARM64 simulator builds.
 
 gczeal(0);
+gcparam('maxNurseryBytes', 16 * 1024 * 1024);
 gcparam('minNurseryBytes', 16 * 1024 * 1024);
 
 let a = [];