Work around pr23045 and make it easier to reproduce.

Dropping old debug format requires the entire module to be read upfront.

This was failing only with the gold plugin, but that is just because
llvm-link was not upgrading metadata.

The new testcase using llvm-link shows the problem.

llvm-svn: 233381

llvm/test/Linker/drop-debug.ll

@@ -0,0 +1,6 @@
+; RUN: llvm-link %p/Inputs/drop-debug.bc -o %t 2>&1 | FileCheck %s
+
+;; drop-debug.bc was created from "void f(void) {}" with clang 3.5 and
+; -gline-tables-only, so it contains old debug info.
+
+; CHECK: warning: ignoring debug info with an invalid version (1) in {{.*}}/Inputs/drop-debug.bc

llvm/tools/gold/gold-plugin.cpp

@@ -20,7 +20,6 @@
 #include "llvm/Bitcode/ReaderWriter.h"
 #include "llvm/CodeGen/Analysis.h"
 #include "llvm/CodeGen/CommandFlags.h"
-#include "llvm/IR/AutoUpgrade.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DiagnosticInfo.h"
 #include "llvm/IR/DiagnosticPrinter.h"
@@ -603,8 +602,11 @@ getModuleForFile(LLVMContext &Context, claimed_file &F,
 
   Module &M = Obj.getModule();
 
-  M.materializeMetadata();
+  // Fixme (pr23045). We would like to upgrade the metadata with something like
-  UpgradeDebugInfo(M);
+  //  Result->materializeMetadata();
+  //  UpgradeDebugInfo(*Result);
+  // but that fails to drop old debug info from function bodies.
+  M.materializeAllPermanently();
 
   SmallPtrSet<GlobalValue *, 8> Used;
   collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ false);

llvm/tools/llvm-link/llvm-link.cpp

@@ -69,6 +69,12 @@ loadFile(const char *argv0, const std::string &FN, LLVMContext &Context) {
   if (!Result)
     Err.print(argv0, errs());
 
+  // Fixme (pr23045). We would like to upgrade the metadata with something like
+  //  Result->materializeMetadata();
+  //  UpgradeDebugInfo(*Result);
+  // but that fails to drop old debug info from function bodies.
+  Result->materializeAllPermanently();
+
   return Result;
 }