Add missing stdbool.h module. The test suite now passes on OS X with modules

llvm-svn: 288787
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: d9cbffb0dfb6a7e6774dc05f29022c8faff29c68
diff --git a/include/module.modulemap b/include/module.modulemap
index 13fa499..0485c2a 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -40,7 +40,10 @@
     // FIXME: <stdalign.h> is missing.
     // <signal.h> provided by C library.
     // <stdarg.h> provided by compiler.
-    // <stdbool.h> provided by compiler.
+    module stdbool_h {
+      header "stdbool.h"
+      export *
+    }
     module stddef_h {
       // <stddef.h>'s __need_* macros require textual inclusion.
       textual header "stddef.h"