[NFC] Clean up doc comment and implementation for Module::isSubModuleOf.

Patch by Varun Gandhi!

Differential Revision: https://reviews.llvm.org/D84087

1 files changed, 3 insertions, 7 deletions

diff --git a/clang/lib/Basic/Module.cpp b/clang/lib/Basic/Module.cpp
index b3daaa3..b25248d 100644
--- a/clang/lib/Basic/Module.cpp
+++ b/clang/lib/Basic/Module.cpp
@@ -173,14 +173,10 @@ bool Module::isAvailable(const LangOptions &LangOpts, const TargetInfo &Target,
 }
 
 bool Module::isSubModuleOf(const Module *Other) const {
-  const Module *This = this;
-  do {
-    if (This == Other)
+  for (auto *Parent = this; Parent; Parent = Parent->Parent) {
+    if (Parent == Other)
       return true;
-
-    This = This->Parent;
-  } while (This);
-
+  }
   return false;
 }