Fix a typo reported in IRC by someone reviewing this code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153815 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/InlineCost.cpp b/lib/Analysis/InlineCost.cpp
index 3ad36f1..246e679 100644
--- a/lib/Analysis/InlineCost.cpp
+++ b/lib/Analysis/InlineCost.cpp
@@ -266,7 +266,7 @@
   // FIXME: Check whether inlining will turn a dynamic alloca into a static
   // alloca, and handle that case.
 
-  // We will happily inline tatic alloca instructions or dynamic alloca
+  // We will happily inline static alloca instructions or dynamic alloca
   // instructions in always-inline situations.
   if (AlwaysInline || I.isStaticAlloca())
     return Base::visitAlloca(I);