[clang] [llvm] [ThinLTO]Record import type in GlobalValueSummary::GVFlags (PR #87597)

[Mingming Liu via cfe-commits]

minglotus-6 wrote:

Resolve review feedback, and 'backfilled' three affected tests in `clang/test/CodeGen`. Now `ninja check-llvm check-clang check-compiler-rt` passed locally.

https://github.com/llvm/llvm-project/pull/87597