Comment typeo fix, thanks Duncan!

llvm-svn: 60429
diff --git a/llvm/lib/VMCore/Value.cpp b/llvm/lib/VMCore/Value.cpp
index 1b023e2..eedda51 100644
--- a/llvm/lib/VMCore/Value.cpp
+++ b/llvm/lib/VMCore/Value.cpp
@@ -358,7 +358,7 @@
   return this;
 }
 
-/// DoPHITranslation - If this value is a PHI node with CurBB as a its parent,
+/// DoPHITranslation - If this value is a PHI node with CurBB as its parent,
 /// return the value in the PHI node corresponding to PredBB.  If not, return
 /// ourself.  This is useful if you want to know the value something has in a
 /// predecessor block.