Rename ASTSourceDescriptor::ModuleName to FullModuleName for clarity.

llvm-svn: 248070
diff --git a/clang/lib/AST/ExternalASTSource.cpp b/clang/lib/AST/ExternalASTSource.cpp
index 62d41d3..8d32dd2 100644
--- a/clang/lib/AST/ExternalASTSource.cpp
+++ b/clang/lib/AST/ExternalASTSource.cpp
@@ -29,7 +29,7 @@
 }
 
 ExternalASTSource::ASTSourceDescriptor::ASTSourceDescriptor(const Module &M)
-    : ModuleName(M.getFullModuleName()), Signature(M.Signature) {
+    : FullModuleName(M.getFullModuleName()), Signature(M.Signature) {
   if (M.Directory)
     Path = M.Directory->getName();
   if (auto *File = M.getASTFile())