[wasm] Speed up multiple-code-spaces test

TurboFan generates significantly less code than Liftoff for this test,
and depending on timing it can happen that we need to generate thousands
of functions, which takes some time and occasionally runs into timeouts.
Thus disable tier-up for this test, such that we stick with the much
longer Liftoff code, and reach the four separate code spaces quicker.

R=ahaas@chromium.org

Change-Id: I8e9a0cb466c1bdfef29aceeb5dd31aa96d05b70b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2352490Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69369}

test/mjsunit/wasm/multiple-code-spaces.js

@@ -5,6 +5,10 @@
 // Flags: --allow-natives-syntax --randomize-all-allocations
 // Flags: --wasm-max-initial-code-space-reservation=1
 
+// Disable tier-up, to reduce execution time of this test (Liftoff generates
+// much bigger code, thus reaches the four code spaces much faster).
+// Flags: --no-wasm-tier-up
+
 load('test/mjsunit/wasm/wasm-module-builder.js');
 
 // Instantiate bigger modules, until at least four separate code spaces have