Add module definitions for string_view

llvm-svn: 288733
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: ca648c9787c7c82ddb9b1c13353df46d085fa366
diff --git a/include/module.modulemap b/include/module.modulemap
index 88e6590..af32dfc 100644
--- a/include/module.modulemap
+++ b/include/module.modulemap
@@ -393,6 +393,14 @@
   module string {
     header "string"
     export initializer_list
+    export string_view
+    export __string
+    export *
+  }
+  module string_view {
+    header "string_view"
+    export initializer_list
+    export __string
     export *
   }
   module strstream {
@@ -468,6 +476,7 @@
   module __split_buffer { header "__split_buffer" export * }
   module __sso_allocator { header "__sso_allocator" export * }
   module __std_stream { header "__std_stream" export * }
+  module __string { header "__string" export * }
   module __tree { header "__tree" export * }
   module __tuple { header "__tuple" export * }
   module __undef_min_max { header "__undef_min_max" export * }