Add mangling for VTTs.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85363 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index 2e6034b..b001595 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -52,6 +52,7 @@
     void mangleGuardVariable(const VarDecl *D);
 
     void mangleCXXVtable(const CXXRecordDecl *RD);
+    void mangleCXXVTT(const CXXRecordDecl *RD);
     void mangleCXXRtti(const CXXRecordDecl *RD);
     void mangleCXXCtor(const CXXConstructorDecl *D, CXXCtorType Type);
     void mangleCXXDtor(const CXXDestructorDecl *D, CXXDtorType Type);
@@ -204,6 +205,12 @@
   mangleName(RD);
 }
 
+void CXXNameMangler::mangleCXXVTT(const CXXRecordDecl *RD) {
+  // <special-name> ::= TT <type>  # VTT structure
+  Out << "_ZTT";
+  mangleName(RD);
+}
+
 void CXXNameMangler::mangleCXXRtti(const CXXRecordDecl *RD) {
   // <special-name> ::= TI <type>  # typeinfo structure
   Out << "_ZTI";