[clang] [clang][Sema] Allow splat initialization of a sizeless vector in a C++ code (PR #205432)

[Paul Osmialowski via cfe-commits]

pawosm-arm wrote:

> this PR is changing the behaviour for builtin scalable vector types

You're right, changing the behaviour is bad, so I'm closing it.


https://github.com/llvm/llvm-project/pull/205432