Run Crankshaft on a separate thread.

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 c52c5788dbce107e3db13e444bac44af56cd9c1e..50efa3aba9e46ee5ebe494867b59d71c9fc8c145 100644
--- a/test/cctest/test-deoptimization.cc
+++ b/test/cctest/test-deoptimization.cc
@@ -413,6 +413,8 @@ static void TestDeoptimizeBinaryOpHelper(LocalContext* env,
 
   // Compile an optimized version of f.
   i::FLAG_always_opt = true;
+  // Be deterministic.
+  i::FLAG_concurrent_crankshaft = false;
   CompileRun(f_source);
   CompileRun("f(7, new X());");
   CHECK(!i::V8::UseCrankshaft() ||
@@ -511,6 +513,9 @@ TEST(DeoptimizeCompare) {
 
     // Compile an optimized version of f.
     i::FLAG_always_opt = true;
+    // Be deterministic.
+    i::FLAG_concurrent_crankshaft = false;
+
     CompileRun(f_source);
     CompileRun("f('a', new X());");
     CHECK(!i::V8::UseCrankshaft() ||
@@ -575,6 +580,8 @@ TEST(DeoptimizeLoadICStoreIC) {
 
     // Compile an optimized version of the functions.
     i::FLAG_always_opt = true;
+    // Be deterministic.
+    i::FLAG_concurrent_crankshaft = false;
     CompileRun(f1_source);
     CompileRun(g1_source);
     CompileRun(f2_source);
@@ -659,6 +666,9 @@ TEST(DeoptimizeLoadICStoreICNested) {
 
     // Compile an optimized version of the functions.
     i::FLAG_always_opt = true;
+    // Be deterministic.
+    i::FLAG_concurrent_crankshaft = false;
+
     CompileRun(f1_source);
     CompileRun(g1_source);
     CompileRun(f2_source);