[modules] Add module maps for LLVM. These are not quite ready for prime-time
yet, but only a few more Clang patches need to land. (I have 'ninja check'
passing locally.)

llvm-svn: 209269
diff --git a/llvm/lib/AsmParser/module.modulemap b/llvm/lib/AsmParser/module.modulemap
new file mode 100644
index 0000000..cc30006
--- /dev/null
+++ b/llvm/lib/AsmParser/module.modulemap
@@ -0,0 +1 @@
+module AsmParser { requires cplusplus umbrella "." module * { export * } }