Fix a handful of typos (closure->block) to avoid confusion.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55768 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 320f3ac..ce749e3 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -817,15 +817,15 @@
     /// c/v/r qualifiers, which we accept as an extension.
     CompatiblePointerDiscardsQualifiers,
 
-    /// IntToBlockPointer - The assignment converts an int to a closure 
+    /// IntToBlockPointer - The assignment converts an int to a block 
     /// pointer. We disallow this.
     IntToBlockPointer,
 
-    /// IncompatibleBlockPointer - The assignment is between two closure 
+    /// IncompatibleBlockPointer - The assignment is between two block 
     /// pointers types that are not compatible.
     IncompatibleBlockPointer,
     
-    /// BlockVoidPointer - The assignment is between a closure pointer and
+    /// BlockVoidPointer - The assignment is between a block pointer and
     /// void*, we accept for now.
     BlockVoidPointer,