[Object] Improve ArchiveWriter diagnostics

Print out the archive member that failed, to make debugging easier.

Before:
  error: failed to build archive: Not an int attribute (Producer: 'LLVM15.0.1git' Reader: 'LLVM 14.0.5-rust-dev')
After:
  error: failed to build archive: 'fake_bt_keystore.o': Not an int attribute (Producer: 'LLVM15.0.1git' Reader: 'LLVM 14.0.5-rust-dev')

Differential Revision: https://reviews.llvm.org/D133607