Fix GetCurrentThreadId for Solaris etc..

BUG=v8:3620
R=svenpanne@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/653263003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24634 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/base/platform/platform-posix.cc

@@ -260,7 +260,7 @@ int OS::GetCurrentThreadId() {
 #elif V8_OS_ANDROID
   return static_cast<int>(gettid());
 #else
-  return reinterpret_cast<int>(pthread_self());
+  return static_cast<int>(pthread_self());
 #endif
 }