Fix performance regressions due to lazy initialization.

src/platform-cygwin.cc

Index: src/platform-cygwin.cc
diff --git a/src/platform-cygwin.cc b/src/platform-cygwin.cc
index fa6fce024b66b25eaa17b04ce66e10bfd4f66707..273ffff47ee7e249c5f72890d4505ba590f9a429 100644
--- a/src/platform-cygwin.cc
+++ b/src/platform-cygwin.cc
@@ -73,6 +73,14 @@ void OS::SetUp() {
 }
 
 
+void MathSetup();  // Defined in platform-posix.cc.

[danno, 2012/03/29 12:32:42]

I really don't like having this external declaration here. It seems like
overkill to create a platform-posix.h just to contain it, but I think I might
prefer it to the multiple platform-specific declarations.

[Philippe, 2012/03/29 13:06:53]

Done. Indeed. platform-posix.h might also serve later.

+
+void OS::PostSetUp() {
+  // Math functions depend on CPU features therefore they are initialized after
+  // CPU.
+  MathSetup();
+}
+
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
   return 0;  // Nothing special about Cygwin.
 }