[clang] [clang][SYCL] Add sycl_external attribute and restrict emitting device code (PR #140282)

[via cfe-commits]

================
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// expected-warning@+1{{'clang::sycl_external' attribute ignored}}
+[[clang::sycl_external]] void bar() {}
+
+// expected-warning@+1{{'clang::sycl_external' attribute ignored}}
+[[clang::sycl_external]] int a;
+
+// expected-warning@+2{{'clang::sycl_external' attribute ignored}}
+namespace not_sycl {
+[[clang::sycl_external]] void foo() {}
+}
----------------
schittir wrote:

```
template<typename T>
[[clang::sycl_external]] void ft(T) {}
template void ft(int);
```


https://github.com/llvm/llvm-project/pull/140282
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