Rollup merge of #122381 - krasimirgg:llvm-19-mar, r=durin42

llvm-wrapper: adapt for LLVM API changes

Adapts rust for 9997e03971.

`@rustbot` label: +llvm-main
r? `@durin42`

compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp

@@ -1112,11 +1112,16 @@ extern "C" LLVMValueRef LLVMRustDIBuilderInsertDeclareAtEnd(
     LLVMRustDIBuilderRef Builder, LLVMValueRef V, LLVMMetadataRef VarInfo,
     uint64_t *AddrOps, unsigned AddrOpsCount, LLVMMetadataRef DL,
     LLVMBasicBlockRef InsertAtEnd) {
-  return wrap(Builder->insertDeclare(
+  auto Result = Builder->insertDeclare(
       unwrap(V), unwrap<DILocalVariable>(VarInfo),
       Builder->createExpression(llvm::ArrayRef<uint64_t>(AddrOps, AddrOpsCount)),
       DebugLoc(cast<MDNode>(unwrap(DL))),
-      unwrap(InsertAtEnd)));
+      unwrap(InsertAtEnd));
+#if LLVM_VERSION_GE(19, 0)
+  return wrap(Result.get<llvm::Instruction *>());
+#else
+  return wrap(Result);
+#endif
 }
 
 extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateEnumerator(