Rollup merge of #128970 - DianQK:lint-llvm-ir, r=nikic

Add `-Zlint-llvm-ir`

This flag is similar to `-Zverify-llvm-ir` and allows us to lint the generated IR.

r? compiler

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -571,6 +571,7 @@ pub(crate) unsafe fn llvm_optimize(
             cgcx.opts.cg.linker_plugin_lto.enabled(),
             config.no_prepopulate_passes,
             config.verify_llvm_ir,
+            config.lint_llvm_ir,
             using_thin_buffers,
             config.merge_functions,
             unroll_loops,