Fix comment from previous patch

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107717 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86MCCodeEmitter.cpp b/lib/Target/X86/X86MCCodeEmitter.cpp
index e665cc7..fff7dae 100644
--- a/lib/Target/X86/X86MCCodeEmitter.cpp
+++ b/lib/Target/X86/X86MCCodeEmitter.cpp
@@ -502,7 +502,7 @@
     }
 
     // If the last register should be encoded in the immediate field
-    // ignored it here.
+    // do not use any bit from VEX prefix to this register, ignore it
     if ((TSFlags >> 32) & X86II::VEX_I8IMM)
       NumOps--;