Flush the optimizing compilejob queue when doing memory pressure GCs

R=ulan@chromium.org,hpayer@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2145683003
Cr-Commit-Position: refs/heads/master@{#37726}

src/compiler.cc

@@ -23,6 +23,7 @@
 #include "src/frames-inl.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/globals.h"
+#include "src/heap/heap.h"
 #include "src/interpreter/interpreter.h"
 #include "src/isolate-inl.h"
 #include "src/log-inl.h"
@@ -705,6 +706,15 @@ bool GetOptimizedCodeLater(CompilationJob* job) {
     return false;
   }
 
+  if (isolate->heap()->HighMemoryPressure()) {
+    if (FLAG_trace_concurrent_recompilation) {
+      PrintF("  ** High memory pressure, will retry optimizing ");
+      info->closure()->ShortPrint();
+      PrintF(" later.\n");
+    }
+    return false;
+  }
+
   // All handles below this point will be allocated in a deferred handle scope
   // that is detached and handed off to the background thread when we return.
   CompilationHandleScope handle_scope(info);

src/heap/heap.cc

@@ -4373,6 +4373,13 @@ class MemoryPressureInterruptTask : public CancelableTask {
 };
 
 void Heap::CheckMemoryPressure() {
+  if (HighMemoryPressure()) {
+    if (isolate()->concurrent_recompilation_enabled()) {
+      // The optimizing compiler may be unnecessarily holding on to memory.
+      DisallowHeapAllocation no_recursive_gc;
+      isolate()->optimizing_compile_dispatcher()->Flush();
+    }
+  }
   if (memory_pressure_level_.Value() == MemoryPressureLevel::kCritical) {
     CollectGarbageOnMemoryPressure("memory pressure");
   } else if (memory_pressure_level_.Value() == MemoryPressureLevel::kModerate) {