Avoid extra cast()s after CStr::as_ptr()

These used to be `&str` literals that did need a pointer cast, but that
became a no-op after switching to `c""` literals in #118566.

compiler/rustc_codegen_llvm/src/allocator.rs

@@ -149,7 +149,7 @@ fn create_wrapper_function(
         }
         llvm::LLVMRustSetVisibility(callee, llvm::Visibility::Hidden);
 
-        let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, c"entry".as_ptr().cast());
+        let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, c"entry".as_ptr());
 
         let llbuilder = llvm::LLVMCreateBuilderInContext(llcx);
         llvm::LLVMPositionBuilderAtEnd(llbuilder, llbb);