Clean up the usage of V8_TARGET_ARCH_${arch} and V8_HOST_ARCH_${arch}

test/cctest/test-lockers.cc

Index: test/cctest/test-lockers.cc
===================================================================
--- test/cctest/test-lockers.cc	(revision 15346)
+++ test/cctest/test-lockers.cc	(working copy)
@@ -207,7 +207,7 @@
 
 // Run many threads all locking on the same isolate
 TEST(IsolateLockingStress) {
-#ifdef V8_TARGET_ARCH_MIPS
+#if V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
   const int kNThreads = 100;
@@ -244,7 +244,7 @@
 
 // Run many threads each accessing its own isolate without locking
 TEST(MultithreadedParallelIsolates) {
-#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
+#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 10;
 #else
   const int kNThreads = 50;
@@ -282,7 +282,7 @@
 
 // Run  many threads with nested locks
 TEST(IsolateNestedLocking) {
-#ifdef V8_TARGET_ARCH_MIPS
+#if V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
   const int kNThreads = 100;
@@ -323,7 +323,7 @@
 
 // Run parallel threads that lock and access different isolates in parallel
 TEST(SeparateIsolatesLocksNonexclusive) {
-#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
+#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
   const int kNThreads = 100;
@@ -399,7 +399,7 @@
 
 // Use unlocker inside of a Locker, multiple threads.
 TEST(LockerUnlocker) {
-#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
+#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
   const int kNThreads = 100;
@@ -452,7 +452,7 @@
 
 // Use Unlocker inside two Lockers.
 TEST(LockTwiceAndUnlock) {
-#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
+#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
   const int kNThreads = 100;
@@ -573,7 +573,7 @@
 
 // Locker inside an Unlocker inside a Locker.
 TEST(LockUnlockLockMultithreaded) {
-#ifdef V8_TARGET_ARCH_MIPS
+#if V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
   const int kNThreads = 100;
@@ -628,7 +628,7 @@
 
 // Locker inside an Unlocker inside a Locker for default isolate.
 TEST(LockUnlockLockDefaultIsolateMultithreaded) {
-#ifdef V8_TARGET_ARCH_MIPS
+#if V8_TARGET_ARCH_MIPS
   const int kNThreads = 50;
 #else
   const int kNThreads = 100;
@@ -699,7 +699,7 @@
 // Test installing extensions in separate isolates concurrently.
 // http://code.google.com/p/v8/issues/detail?id=1821
 TEST(ExtensionsRegistration) {
-#if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS)
+#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
   const int kNThreads = 10;
 #else
   const int kNThreads = 40;