Robustify instantiation of templates when there are errors in the
template definition. Do this both by being more tolerant of errors in
our asserts and by not dropping a variable declaration completely when
its initializer is ill-formed. Fixes the crash-on-invalid in PR6375,
but not the original issue.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97463 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.h b/lib/Sema/Sema.h
index 0fe9b7f..da192dd 100644
--- a/lib/Sema/Sema.h
+++ b/lib/Sema/Sema.h
@@ -3413,7 +3413,8 @@
 
     Decl *getInstantiationOf(const Decl *D) {
       Decl *Result = LocalDecls[D];
-      assert(Result && "declaration was not instantiated in this scope!");
+      assert((Result || D->isInvalidDecl()) && 
+             "declaration was not instantiated in this scope!");
       return Result;
     }