[tests] Increase failure threshold for Wasm execution test

Changes the failure rate for LiveTests.testWasmCodeGenerationAndCompilationAndExecution from 25% to 35%.

This threshold should be reduced again once ref.cast is properly handled.

Change-Id: I92938e5c58ce6171627cc003a13d5344c9cafe70
Reviewed-on: https://chrome-internal-review.googlesource.com/c/v8/fuzzilli/+/9087656
Commit-Queue: Matthias Liedtke <mliedtke@google.com>
Auto-Submit: Dominik Klemba <tacet@google.com>
Commit-Queue: Dominik Klemba <tacet@google.com>
Reviewed-by: Matthias Liedtke <mliedtke@google.com>

Author: Dominik Klemba

Tests/FuzzilliTests/LiveTests.swift

@@ -158,8 +158,9 @@ class LiveTests: XCTestCase {
             }
         }
 
-        // We expect a maximum of 25% of Wasm execution attempts to fail.
-        checkFailureRate(testResults: results, maxFailureRate: 0.25)
+        // TODO(mliedtke): Figure out how to handle ref.cast and lower it.
+        // We expect a maximum of 35% of Wasm execution attempts to fail.
+        checkFailureRate(testResults: results, maxFailureRate: 0.35)
     }
 
     // The closure can use the ProgramBuilder to emit a program of a specific