Update comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130582 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp
index 914c78b..315aedd 100644
--- a/lib/CodeGen/Passes.cpp
+++ b/lib/CodeGen/Passes.cpp
@@ -55,8 +55,8 @@
     RegisterRegAlloc::setDefault(RegAlloc);
   }
 
-  // This forces linking of the greedy register allocator, so -regalloc=greedy
-  // works in clang.
+  // This forces linking of the linear scan register allocator,
+  // so -regalloc=linearscan still works in clang.
   if (Ctor == createLinearScanRegisterAllocator)
     return createLinearScanRegisterAllocator();