[heap] Introduce enum of garbage collection reasons.

test/cctest/test-deoptimization.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
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  private:
   bool allow_natives_syntax_;
   bool turbo_inlining_;
   bool use_inlining_;
 };
 
 
 // Abort any ongoing incremental marking to make sure that all weak global
 // handle callbacks are processed.
 static void NonIncrementalGC(i::Isolate* isolate) {
-  isolate->heap()->CollectAllGarbage();
+  isolate->heap()->CollectAllGarbage(i::Heap::kFinalizeIncrementalMarkingMask,
+                                     i::GarbageCollectionReason::kTesting);
 }
 
 
 static Handle<JSFunction> GetJSFunction(v8::Local<v8::Context> context,
                                         const char* property_name) {
   v8::Local<v8::Function> fun = v8::Local<v8::Function>::Cast(
       context->Global()->Get(context, v8_str(property_name)).ToLocalChecked());
   return i::Handle<i::JSFunction>::cast(v8::Utils::OpenHandle(*fun));
 }
 
@@ skipping 802 matching lines @@
                     .FromJust());
     CHECK_EQ(13, env->Global()
                      ->Get(env.local(), v8_str("result"))
                      .ToLocalChecked()
                      ->Int32Value(env.local())
                      .FromJust());
   }
   isolate->Exit();
   isolate->Dispose();
 }