Randomize layout docs

clang/include/clang/Basic/Attr.td

@@ -3206,5 +3206,5 @@ def RandomizeLayout : InheritableAttr {
   let Spellings = [GCC<"randomize_layout">, Declspec<"randomize_layout">,
     Keyword<"randomize_layout">];
   let Subjects = SubjectList<[Record]>;
-  let Documentation = [Undocumented];
+  let Documentation = [ClangRandstructDocs];
 }

clang/include/clang/Basic/AttrDocs.td

@@ -4094,4 +4094,22 @@ Likewise, when applied to a strong local variable, that variable becomes
 ``const`` and is considered externally-retained.
 
 When compiled without ``-fobjc-arc``, this attribute is ignored.
-}]; }
+}]; 
+}
+
+def ClangRandstructDocs : Documentation {
+  let Category = DocCatVariable;
+  let Content = [{
+The attribute ``randomize_layout`` can be applied to the declaration of
+a record. ``randomize_layout`` instructs the compiler to randomize the memory layout 
+of the member variables of the record.
+.. code-block:: c
+
+  // Indicates that this struct should be randomized by Randstruct implementation.
+  struct s {
+    char *a;
+    char *b;
+    char *c;
+  }__attribute__((randomize_layout));
+}];
+}

clang/lib/AST/RecordLayoutBuilder.cpp

@@ -2986,11 +2986,12 @@ ASTContext::getASTRecordLayout(const RecordDecl *D) const {
   if (Entry) return *Entry;
 
   const ASTRecordLayout *NewEntry = nullptr;
-
+  
   bool ShouldBeRandomized = D->getAttr<RandomizeLayoutAttr>() != nullptr;
+
   if (ShouldBeRandomized) {
-	  Randstruct randstruct;
-	  randstruct.reorganizeFields(*this, D);
+    Randstruct randstruct;
+    randstruct.reorganizeFields(*this,D);
   }
 
   if (isMsLayout(*this)) {