[AST] Fix a whitespace typo [NFC]

llvm-svn: 340384
diff --git a/llvm/lib/Analysis/AliasSetTracker.cpp b/llvm/lib/Analysis/AliasSetTracker.cpp
index a9b01df..e5e3ba0 100644
--- a/llvm/lib/Analysis/AliasSetTracker.cpp
+++ b/llvm/lib/Analysis/AliasSetTracker.cpp
@@ -259,7 +259,7 @@
   if (size() != 0)
     // Can't track source of pointer, might be many instruction
     return nullptr;
- if (1 != UnknownInsts.size())
+  if (1 != UnknownInsts.size())
     return nullptr;
   return cast<Instruction>(UnknownInsts[0]);
 }