Modify some deleted function methods to better reflect reality:

- New isDefined() function checks for deletedness
 - isThisDeclarationADefinition checks for deletedness
 - New doesThisDeclarationHaveABody() does what
   isThisDeclarationADefinition() used to do
 - The IsDeleted bit is not propagated across redeclarations
 - isDeleted() now checks the canoncial declaration
 - New isDeletedAsWritten() does what it says on the tin.
 - isUserProvided() now correct (thanks Richard!)

This fixes the bug that we weren't catching

void foo() = delete;
void foo() {}

as being a redefinition.

llvm-svn: 131013

clang/lib/CodeGen/ModuleBuilder.cpp

@@ -79,7 +79,7 @@ namespace {
                                      MEnd = D->decls_end();
              M != MEnd; ++M)
           if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*M))
-            if (Method->isThisDeclarationADefinition() &&
+            if (Method->doesThisDeclarationHaveABody() &&
                 (Method->hasAttr<UsedAttr>() || 
                  Method->hasAttr<ConstructorAttr>()))
               Builder->EmitTopLevelDecl(Method);