Fix busted data_layout (mismatch vs LLVM) in x86_64 tvOS simulator target

Author: thomcc

compiler/rustc_target/src/spec/x86_64_apple_tvos.rs

@@ -6,7 +6,8 @@ pub fn target() -> Target {
     Target {
         llvm_target: "x86_64-apple-tvos".into(),
         pointer_width: 64,
-        data_layout: "e-m:o-i64:64-f80:128-n8:16:32:64-S128".into(),
+        data_layout: "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+            .into(),
         arch: arch.target_arch(),
         options: TargetOptions {
             max_atomic_width: Some(64),