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..8e770979b7c1c94da16dd56a7c16c00e64ec59b2 100644
--- a/src/platform-solaris.cc
+++ b/src/platform-solaris.cc
@@ -102,6 +102,15 @@ void OS::SetUp() {
 }
 
 
+void MathSetup();  // Defined in platform-posix.cc.
+
+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.
 }