Use more than a single wasm page in Asyncify fuzzing (#5597)

I saw a testcase fail on the internal assertion of the buffer being too small.
Enlarge it to use as much of the memory we have anyhow to reduce that
risk (we can use 15 pages instead of 1, without changing anything else).

1 files changed, 3 insertions, 1 deletions

diff --git a/scripts/fuzz_shell.js b/scripts/fuzz_shell.js
index 0f413c2e6..217727c91 100644
--- a/scripts/fuzz_shell.js
+++ b/scripts/fuzz_shell.js
@@ -45,7 +45,9 @@ var Asyncify = {
   sleeps: 0,
   maxDepth: 0,
   DATA_ADDR: 4,
-  DATA_MAX: 65536,
+  // The fuzzer emits memories of size 16 (pages). Allow us to use almost all of
+  // that (we start from offset 4, so we can't use them all).
+  DATA_MAX: 15 * 65536,
   savedMemory: null,
   instrumentImports: function(imports) {
     var ret = {};