Disable always-opt for locker tests.

In no-snap mode, creating 100 contexts can take a while.
This becomes even worse with always-opt.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1092003002

Cr-Commit-Position: refs/heads/master@{#27910}

test/cctest/test-lockers.cc

@@ -209,6 +209,7 @@ static void StartJoinAndDeleteThreads(const i::List<JoinableThread*>& threads) {
 
 // Run many threads all locking on the same isolate
 TEST(IsolateLockingStress) {
+  i::FLAG_always_opt = false;
 #if V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
@@ -250,6 +251,7 @@ class IsolateNestedLockingThread : public JoinableThread {
 
 // Run  many threads with nested locks
 TEST(IsolateNestedLocking) {
+  i::FLAG_always_opt = false;
 #if V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
@@ -292,6 +294,7 @@ class SeparateIsolatesLocksNonexclusiveThread : public JoinableThread {
 
 // Run parallel threads that lock and access different isolates in parallel
 TEST(SeparateIsolatesLocksNonexclusive) {
+  i::FLAG_always_opt = false;
 #if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
@@ -369,6 +372,7 @@ class LockerUnlockerThread : public JoinableThread {
 
 // Use unlocker inside of a Locker, multiple threads.
 TEST(LockerUnlocker) {
+  i::FLAG_always_opt = false;
 #if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
@@ -423,6 +427,7 @@ class LockTwiceAndUnlockThread : public JoinableThread {
 
 // Use Unlocker inside two Lockers.
 TEST(LockTwiceAndUnlock) {
+  i::FLAG_always_opt = false;
 #if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else