Auto merge of #118566 - klensy:cstr-new, r=WaffleLapkin

use c literals in compiler and library

Relands refreshed https://github.com/rust-lang/rust/pull/111647

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -631,7 +631,7 @@ pub(crate) fn run_pass_manager(
             llvm::LLVMRustAddModuleFlag(
                 module.module_llvm.llmod(),
                 llvm::LLVMModFlagBehavior::Error,
-                "LTOPostLink\0".as_ptr().cast(),
+                c"LTOPostLink".as_ptr().cast(),
                 1,
             );
         }