[lld][WebAssembly] Give better error message on bad archive member

Include the archive name as well as the member name when an error
is encountered parsing bitcode archives.

Differential Revision: https://reviews.llvm.org/D82884

Author: sbc100

lld/test/wasm/lto/incompatible.ll

@@ -2,7 +2,11 @@
 ; RUN: llvm-as %s -o %t.bc
 ; RUN: not wasm-ld %t.bc -o %t.wasm 2>&1 | FileCheck %s
 
+; RUN: llvm-ar rc %t.a %t.bc
+; RUN: not wasm-ld --whole-archive %t.a -o %t.wasm 2>&1 | FileCheck %s --check-prefix=CHECK-ARCHIVE
+
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
 
 ; CHECK: {{.*}}incompatible.ll.tmp.bc: machine type must be wasm32
+; CHECK-ARCHIVE: wasm-ld: error: {{.*}}.a(incompatible.ll.tmp.bc): machine type must be wasm32

lld/test/wasm/lto/libcall-truncsfhf2.ll

@@ -17,4 +17,4 @@ define void @_start() {
   ret void
 }
 
-; CHECK: wasm-ld: error: {{.*}}truncsfhf2.o: attempt to add bitcode file after LTO.
+; CHECK: wasm-ld: error: {{.*}}truncsfhf2.o): attempt to add bitcode file after LTO.

lld/wasm/InputFiles.cpp

@@ -569,16 +569,15 @@ bool BitcodeFile::doneLTO = false;
 
 void BitcodeFile::parse() {
   if (doneLTO) {
-    error(toString(mb.getBufferIdentifier()) +
-          ": attempt to add bitcode file after LTO.");
+    error(toString(this) + ": attempt to add bitcode file after LTO.");
     return;
   }
 
   obj = check(lto::InputFile::create(MemoryBufferRef(
       mb.getBuffer(), saver.save(archiveName + mb.getBufferIdentifier()))));
   Triple t(obj->getTargetTriple());
   if (t.getArch() != Triple::wasm32) {
-    error(toString(mb.getBufferIdentifier()) + ": machine type must be wasm32");
+    error(toString(this) + ": machine type must be wasm32");
     return;
   }
   std::vector<bool> keptComdats;