Fix performance regressions due to lazy initialization.

src/platform-solaris.cc

Index: src/platform-solaris.cc
diff --git a/src/platform-solaris.cc b/src/platform-solaris.cc
index 50ad35339216a7493534ba98dc21d59b3c2c0ae2..e044dbccadaae0b7e534c3ae8f4910a8fcecd609 100644
--- a/src/platform-solaris.cc
+++ b/src/platform-solaris.cc
@@ -52,6 +52,7 @@
 
 #include "v8.h"
 
+#include "platform-posix.h"
 #include "platform.h"
 #include "v8threads.h"
 #include "vm-state-inl.h"
@@ -102,6 +103,13 @@ void OS::SetUp() {
 }
 
 
+void OS::PostSetUp() {
+  // Math functions depend on CPU features therefore they are initialized after
+  // CPU.
+  MathSetup();
+}
+
+
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
   return 0;  // Solaris runs on a lot of things.
 }