Fix typos found by http://github.com/lyda/misspell-check

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157885 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/ExecutionDepsFix.cpp b/lib/CodeGen/ExecutionDepsFix.cpp
index 9237f7e..fee8e47 100644
--- a/lib/CodeGen/ExecutionDepsFix.cpp
+++ b/lib/CodeGen/ExecutionDepsFix.cpp
@@ -59,7 +59,7 @@
 
   // Pointer to the next DomainValue in a chain.  When two DomainValues are
   // merged, Victim.Next is set to point to Victor, so old DomainValue
-  // references can be updated by folowing the chain.
+  // references can be updated by following the chain.
   DomainValue *Next;
 
   // Twiddleable instructions using or defining these registers.