Crash when indexing templates due to name lookup

[Varun Gandhi]

Assertion failed: (DD && "queried property of class with no definition"), function data, file DeclCXX.h, line 452.
[07:00:34 error] worker 0  : Context: processing /Users/varun/Code/llvm-under-test/llvm/lib/Demangle/MicrosoftDemangle.cpp
[07:00:34 error] worker 0  : *** SIGABRT received at time=1684450834 ***
[07:00:34 error] worker 0  : PC: @  0x1a56b0724  __pthread_kill
[07:00:34 error] worker 0  :     @  0x1009cbce4  absl::AbslFailureSignalHandler()
[07:00:34 error] worker 0  :     @  0x1a5716a84  _sigtramp
[07:00:34 error] worker 0  :     @  0x1a56e7c28  pthread_kill
[07:00:34 error] worker 0  :     @  0x1a55f5ae8  abort
[07:00:34 error] worker 0  :     @  0x1a55f4e44  __assert_rtn
[07:00:34 error] worker 0  :     @  0x1007a0f4c  clang::CXXRecordDecl::data()
[07:00:34 error] worker 0  :     @  0x1008a3fa4  clang::CXXRecordDecl::bases()
[07:00:34 error] worker 0  :     @  0x10407e490  clang::CXXBasePaths::lookupInBases()
[07:00:34 error] worker 0  :     @  0x10407d2f8  clang::CXXRecordDecl::lookupInBases()
[07:00:34 error] worker 0  :     @  0x104080a64  clang::CXXRecordDecl::lookupDependentName()
[07:00:34 error] worker 0  :     @  0x1006cc360  scip_clang::ApproximateNameResolver::tryResolveMember()
[07:00:34 error] worker 0  :     @  0x1008a75b8  scip_clang::TuIndexer::trySaveMemberReferenceViaLookup()
[07:00:34 error] worker 0  :     @  0x1008a7208  scip_clang::TuIndexer::saveCXXDependentScopeMemberExpr()