[clang] [Clang][Targets] Fix crash on ARM/AArch64 Windows EABI targets with virtual inheritance (PR #173846)

[Jannik Voss via cfe-commits]

vossjannik wrote:

@yxsamliu: This merge request fixes a regression introduced by your recent improvements in https://github.com/llvm/llvm-project/commit/beea2a941470368a87b1816e455b1db366c1bbb9, maybe you can take a look at it :)

https://github.com/llvm/llvm-project/pull/173846