[turbofan] [wasm] enable switch jump tables by default

With this CL, switch jump tables are enabled even with
--untrusted-code-mitigations

Bug: chromium:849098
Change-Id: I60545ed7bef2cd847710fd9660ef1007aac3b428
Reviewed-on: https://chromium-review.googlesource.com/1110817Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53993}

src/optimized-compilation-info.cc

@@ -28,7 +28,7 @@ OptimizedCompilationInfo::OptimizedCompilationInfo(
   SetFlag(kCalledWithCodeStartRegister);
   if (FLAG_function_context_specialization) MarkAsFunctionContextSpecializing();
   if (FLAG_turbo_splitting) MarkAsSplittingEnabled();
-  if (!FLAG_untrusted_code_mitigations) SetFlag(kSwitchJumpTableEnabled);
+  SetFlag(kSwitchJumpTableEnabled);
   if (FLAG_untrusted_code_mitigations) MarkAsPoisoningRegisterArguments();
 
   // TODO(yangguo): Disable this in case of debugging for crbug.com/826613
@@ -62,12 +62,10 @@ OptimizedCompilationInfo::OptimizedCompilationInfo(
 #endif
   SetTracingFlags(
       PassesFilter(debug_name, CStrVector(FLAG_trace_turbo_filter)));
-  if (!FLAG_untrusted_code_mitigations) {
-    // Embedded builtins don't support embedded absolute code addresses, so we
-    // cannot use jump tables.
-    if (code_kind != Code::BUILTIN) {
-      SetFlag(kSwitchJumpTableEnabled);
-    }
+  // Embedded builtins don't support embedded absolute code addresses, so we
+  // cannot use jump tables.
+  if (code_kind != Code::BUILTIN) {
+    SetFlag(kSwitchJumpTableEnabled);
   }
 }