[clang] [Clang] Always verify LLVM IR inputs (PR #134396)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Might as well do it for bitcode too?  That wouldn't impact LTO scenarios, I think: in LTO, the IR is directly loaded by lld/the LTO plugin.

https://github.com/llvm/llvm-project/pull/134396