Apply debug_compile_units hack also in remove-addrspaces (#58365)

This fixes the issues seen in the LLVM 20 PR

Co-authored-by: Zentrik <llvm.zentrik@gmail.com>

Author: gbaraldi

src/llvm-remove-addrspaces.cpp

@@ -334,7 +334,11 @@ bool removeAddrspaces(Module &M, AddrspaceRemapFunction ASRemapper)
 
         GV->setInitializer(nullptr);
     }
-
+    // Same workaround as in CloneCtx::prepare_vmap to avoid LLVM bug when cloning
+    auto &MD = VMap.MD();
+    for (auto cu: M.debug_compile_units()) {
+        MD[cu].reset(cu);
+    }
     // Similarly, copy over and rewrite function bodies
     for (Function *F : Functions) {
         Function *NF = cast<Function>(VMap[F]);
@@ -414,6 +418,7 @@ bool removeAddrspaces(Module &M, AddrspaceRemapFunction ASRemapper)
         }
     }
 
+
     return true;
 }