[modules] If we have a choice between including a file textually and importing
a prebuilt form from a module, prefer the modular form, all else being equal.

llvm-svn: 229188
diff --git a/clang/test/Modules/Inputs/header-in-multiple-maps/a.h b/clang/test/Modules/Inputs/header-in-multiple-maps/a.h
new file mode 100644
index 0000000..4c5cd94
--- /dev/null
+++ b/clang/test/Modules/Inputs/header-in-multiple-maps/a.h
@@ -0,0 +1 @@
+struct A {};