ART: Improve comment about inlining into try/catch

Change-Id: I66a4fd3206847c8d5bb57b1678d9d3dc94331294
diff --git a/compiler/optimizing/nodes.cc b/compiler/optimizing/nodes.cc
index a0cfe8e..af62a97 100644
--- a/compiler/optimizing/nodes.cc
+++ b/compiler/optimizing/nodes.cc
@@ -1686,8 +1686,9 @@
     // (2) the reverse post order of that graph,
     // (3) the potential loop information they are now in,
     // (4) try block membership.
-    // Note that we do not need to update catch phis because catch blocks cannot
-    // reference vregs from the inlined method.
+    // Note that we do not need to update catch phi inputs because they
+    // correspond to the register file of the outer method which the inlinee
+    // cannot modify.
 
     // We don't add the entry block, the exit block, and the first block, which
     // has been merged with `at`.