[lld-macho] Include archive name in bitcode files

[int3]

make test x-platform

[MaskRay]

LGTM

lld/MachO/InputFiles.cpp

return symtab->addDefined(name, &file, /*isec=*/nullptr, /*value=*/0,
                             /*isReferencedDynamically=*/false,
                             /*noDeadStrip=*/false,
                             /*isWeakDefCanBeHidden=*/false);
 }
 
 BitcodeFile::BitcodeFile(MemoryBufferRef mb, StringRef archiveName,
                          uint64_t offsetInArchive)
     : InputFile(BitcodeKind, mb) {
+  this->archiveName = std::string(archiveName);
   std::string path = mb.getBufferIdentifier().str();
   // ThinLTO assumes that all MemoryBufferRefs given to it have a unique
   // name. If two members with the same name are provided, this causes a
   // collision and ThinLTO can't proceed.
   // So, we append the archive name to disambiguate two members with the same
   // name from multiple different archives, and offset within the archive to
   // disambiguate two members of the same name from a single archive.
   MemoryBufferRef mbref(

lld/test/MachO/lto-archive.ll

 ; REQUIRES: x86
 ; RUN: rm -rf %t; split-file %s %t
 ; RUN: llvm-as %t/foo.ll -o %t/foo.o
 ; RUN: llvm-as %t/has-objc-symbol.ll -o %t/has-objc-symbol.o
 ; RUN: llvm-as %t/has-objc-category.ll -o %t/has-objc-category.o
 ; RUN: llvm-ar rcs %t/foo.a %t/foo.o
 ; RUN: llvm-ar rcs %t/objc.a %t/has-objc-symbol.o %t/has-objc-category.o
 
 ; RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/main.s -o %t/main.o
 ; RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin %t/references-foo.s -o %t/references-foo.o
 
 ; RUN: %lld -lSystem %t/references-foo.o %t/foo.a -o /dev/null -why_load | FileCheck %s --check-prefix=FOO
-; FOO: _foo forced load of foo.o
+; FOO: _foo forced load of {{.+}}foo.a(foo.o)
 
 ; RUN: %lld -lSystem -force_load %t/foo.a %t/main.o -o /dev/null -why_load | FileCheck %s --check-prefix=FORCE-LOAD
-; FORCE-LOAD: -force_load forced load of foo.o
+; FORCE-LOAD: -force_load forced load of {{.+}}foo.a(foo.o)
 
 ; RUN: %lld -lSystem -ObjC -framework CoreFoundation %t/objc.a %t/main.o \
 ; RUN:   -o /dev/null -why_load | FileCheck %s --check-prefix=OBJC
-; OBJC: _OBJC_CLASS_$_Foo forced load of has-objc-symbol.o
-; OBJC: -ObjC forced load of has-objc-category.o
+; OBJC: _OBJC_CLASS_$_Foo forced load of {{.+}}objc.a(has-objc-symbol.o)
+; OBJC: -ObjC forced load of {{.+}}objc.a(has-objc-category.o)
 
 ; RUN: %lld -lSystem %t/foo.a %t/main.o -o %t/no-force-load -why_load | count 0
 
 ; RUN: %lld -lSystem -framework CoreFoundation %t/objc.a %t/main.o -o %t/no-objc -why_load | count 0
 
 ;--- foo.ll
 
 target triple = "x86_64-apple-macosx10.15.0"