Fuzz JSPI (#7148)

* Add a new "sleep" fuzzer import, that does a sleep for some ms.

* Add JSPI support in fuzz_shell.js. This is in the form of commented-out async/await
   keywords - commented out so that normal fuzzing is not impacted. When we want
   to fuzz JSPI, we uncomment them. We also apply the JSPI operations of marking
   imports and exports as suspending/promising.
   JSPI fuzzing is added to both fuzz_opt.py and ClusterFuzz's run.py.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/tools/fuzzing.h b/src/tools/fuzzing.h
index 78219045c..f76ed62a5 100644
--- a/src/tools/fuzzing.h
+++ b/src/tools/fuzzing.h
@@ -117,6 +117,7 @@ private:
   Name callExportCatchImportName;
   Name callRefImportName;
   Name callRefCatchImportName;
+  Name sleepImportName;
 
   std::unordered_map<Type, std::vector<Name>> globalsByType;
   std::unordered_map<Type, std::vector<Name>> mutableGlobalsByType;
@@ -238,6 +239,7 @@ private:
   void addImportCallingSupport();
   void addImportThrowingSupport();
   void addImportTableSupport();
+  void addImportSleepSupport();
   void addHashMemorySupport();
 
   // Special expression makers
@@ -249,6 +251,7 @@ private:
   // Call either an export or a ref. We do this from a single function to better
   // control the frequency of each.
   Expression* makeImportCallCode(Type type);
+  Expression* makeImportSleep(Type type);
   Expression* makeMemoryHashLogging();
 
   // Function creation