missing exception

Summary: windows is also missing __throw_bad_alloc

Test Plan: fbconfig -r folly && fbmake runtests

Reviewed By: delong.j@fb.com

FB internal diff: D1318921

folly/detail/FunctionalExcept.cpp

@@ -32,4 +32,10 @@ void __throw_out_of_range(const char* msg) {
   throw std::out_of_range(msg);
 }
 
+#if defined(_MSC_VER)
+void __throw_bad_alloc() {
+  throw std::bad_alloc();
+}
+#endif
+
 FOLLY_NAMESPACE_STD_END

folly/detail/FunctionalExcept.h

@@ -25,6 +25,10 @@ FOLLY_NORETURN void __throw_length_error(const char* msg);
 FOLLY_NORETURN void __throw_logic_error(const char* msg);
 FOLLY_NORETURN void __throw_out_of_range(const char* msg);
 
+#ifdef _MSC_VER
+FOLLY_NORETURN void __throw_bad_alloc();
+#endif
+
 FOLLY_NAMESPACE_STD_END
 
 #endif