[Minor bug fix] Fix IR Module Printing

[Son Tuan VU via llvm-commits]

Hello,

This is my first time sending patch to LLVM, so please forgive me if it is
not the right way to do it.

The review request can be found at:

https://reviews.llvm.org/D45772

Here's the change:
```
Index: lib/IR/AsmWriter.cpp
===================================================================
--- lib/IR/AsmWriter.cpp        (révision 330263)
+++ lib/IR/AsmWriter.cpp        (copie de travail)
@@ -2369,6 +2369,7 @@
 }

 void AssemblyWriter::printModule(const Module *M) {
+  Out << '\n';
   Machine.initialize();

   if (ShouldPreserveUseListOrder)
```

Please tell me who would be the appropriate reviewer for this.

Thank you in advance for your help

Son Tuan Vu
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