Make these methods const correct.

Thanks to Nick Lewycky for noticing it.

llvm-svn: 187098
diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
index 3d3dc73..968b8f4 100644
--- a/llvm/lib/IR/Module.cpp
+++ b/llvm/lib/IR/Module.cpp
@@ -233,8 +233,7 @@
 /// If AllowLocal is set to true, this function will return types that
 /// have an local. By default, these types are not returned.
 ///
-GlobalVariable *Module::getGlobalVariable(StringRef Name,
-                                          bool AllowLocal) const {
+GlobalVariable *Module::getGlobalVariable(StringRef Name, bool AllowLocal) {
   if (GlobalVariable *Result =
       dyn_cast_or_null<GlobalVariable>(getNamedValue(Name)))
     if (AllowLocal || !Result->hasLocalLinkage())