Enable TurboFan for Win64 targets.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/743963002

Cr-Commit-Position: refs/heads/master@{#25437}

src/globals.h

@@ -33,7 +33,7 @@
 #else
 #define V8_TURBOFAN_BACKEND 0
 #endif
-#if V8_TURBOFAN_BACKEND && !(V8_OS_WIN && V8_TARGET_ARCH_X64)
+#if V8_TURBOFAN_BACKEND
 #define V8_TURBOFAN_TARGET 1
 #else
 #define V8_TURBOFAN_TARGET 0

test/cctest/compiler/test-linkage.cc

@@ -65,8 +65,8 @@ TEST(TestLinkageJSFunctionIncoming) {
     CallDescriptor* descriptor = linkage.GetIncomingDescriptor();
     CHECK_NE(NULL, descriptor);
 
-    CHECK_EQ(1 + i, descriptor->JSParameterCount());
-    CHECK_EQ(1, descriptor->ReturnCount());
+    CHECK_EQ(1 + i, static_cast<int>(descriptor->JSParameterCount()));
+    CHECK_EQ(1, static_cast<int>(descriptor->ReturnCount()));
     CHECK_EQ(Operator::kNoProperties, descriptor->properties());
     CHECK_EQ(true, descriptor->IsJSFunctionCall());
   }
@@ -93,8 +93,8 @@ TEST(TestLinkageJSCall) {
     CallDescriptor* descriptor =
         linkage.GetJSCallDescriptor(i, CallDescriptor::kNoFlags);
     CHECK_NE(NULL, descriptor);
-    CHECK_EQ(i, descriptor->JSParameterCount());
-    CHECK_EQ(1, descriptor->ReturnCount());
+    CHECK_EQ(i, static_cast<int>(descriptor->JSParameterCount()));
+    CHECK_EQ(1, static_cast<int>(descriptor->ReturnCount()));
     CHECK_EQ(Operator::kNoProperties, descriptor->properties());
     CHECK_EQ(true, descriptor->IsJSFunctionCall());
   }