[llvm] re-order LLVM_ABI and extern on NoKernelInfoEndLTO decl (#144601)
## Overview
Fix compilation error introduced by #143615. Build failure logs
available
[here](https://lab.llvm.org/buildbot/#/builders/195/builds/10573)
## Background
On `extern` variable declarations, `LLVM_ABI` must appear before
`extern` because `LLVM_ABI` currently resolves to
`[[gnu::visibility("default")]]` when building with gcc.diff --git a/llvm/include/llvm/Target/TargetMachine.h b/llvm/include/llvm/Target/TargetMachine.h
index 04c97c1..b286efd 100644
--- a/llvm/include/llvm/Target/TargetMachine.h
+++ b/llvm/include/llvm/Target/TargetMachine.h
@@ -29,7 +29,7 @@
#include <string>
#include <utility>
-extern LLVM_ABI llvm::cl::opt<bool> NoKernelInfoEndLTO;
+LLVM_ABI extern llvm::cl::opt<bool> NoKernelInfoEndLTO;
namespace llvm {
