[heap] Introduce enum of garbage collection reasons.

test/cctest/test-deoptimization.cc

Index: test/cctest/test-deoptimization.cc
diff --git a/test/cctest/test-deoptimization.cc b/test/cctest/test-deoptimization.cc
index 7ba16b59f8847332d809edd8edc5e42a9875e9df..0d435c5e1052060d6ab72880ab3437d7dba19858 100644
--- a/test/cctest/test-deoptimization.cc
+++ b/test/cctest/test-deoptimization.cc
@@ -109,7 +109,8 @@ class AllowNativesSyntaxNoInlining {
 // 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);
 }