[NFC] [Clang]: fix spelling mistake in assert message

[Jim]

Could you add "[NFC]" in the title.
That means No Function Change.

[Jim]

Do you need someone to commit this change for you?

[Jim]

Rebase

lib/AST/VTableBuilder.cpp

   // list here because there isn't necessarily an inheritance
   // relationship between the two methods.
   if (LT->getMethodQuals() != RT->getMethodQuals())
     return false;
   return LT->getParamTypes() == RT->getParamTypes();
 }
 
 bool VCallOffsetMap::MethodsCanShareVCallOffset(const CXXMethodDecl *LHS,
                                                 const CXXMethodDecl *RHS) {
   assert(LHS->isVirtual() && "LHS must be virtual!");
-  assert(RHS->isVirtual() && "LHS must be virtual!");
+  assert(RHS->isVirtual() && "RHS must be virtual!");
 
   // A destructor can share a vcall offset with another destructor.
   if (isa<CXXDestructorDecl>(LHS))
     return isa<CXXDestructorDecl>(RHS);
 
   // FIXME: We need to check more things here.
 
   // The methods must have the same name.
   DeclarationName LHSName = LHS->getDeclName();
   DeclarationName RHSName = RHS->getDeclName();