Do not GC prior to every parallel recompile.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 5320fc9ab84b712d2d5ac7772fa028d8db300e1a..5fc107f94306c062b4a0ae506e031836646ceb7e 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -950,9 +950,6 @@ void Compiler::RecompileParallel(Handle<JSFunction> closure) {
         if (status == OptimizingCompiler::SUCCEEDED) {
           info.Detach();
           shared->code()->set_profiler_ticks(0);
-          // Do a scavenge to put off the next scavenge as far as possible.
-          // This may ease the issue that GVN blocks the next scavenge.
-          isolate->heap()->CollectGarbage(NEW_SPACE, "parallel recompile");
           isolate->optimizing_compiler_thread()->QueueForOptimization(compiler);
         } else if (status == OptimizingCompiler::BAILED_OUT) {
           isolate->clear_pending_exception();