Recommit r339943 - Establish the <bit> header. NFC yet. Reviewed as https://reviews.llvm.org/D50815 - with a fix for the sanitizer bots

llvm-svn: 340045
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: e02ee4f013632aac34e1fb84d868984a91773e2a
diff --git a/include/module.modulemap b/include/module.modulemap
index 0895055..681c80b 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -228,6 +228,10 @@
     header "atomic"
     export *
   }
+  module bit {
+    header "bit"
+    export *
+  }
   module bitset {
     header "bitset"
     export string