[clang] [libclc] libclc: remove __attribute__((assume)) for clspv targets (PR #92126)

[Erich Keane via cfe-commits]

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@@ -393,6 +393,8 @@ Attribute Changes in Clang
 - Clang now warns that the ``exclude_from_explicit_instantiation`` attribute
   is ignored when applied to a local class or a member thereof.
 
+- The ``clspv_libclc_builtin`` attribute has been added to allow clspv to identified functions coming from libclc.
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erichkeane wrote:

```suggestion
- The ``clspv_libclc_builtin`` attribute has been added to allow clspv to identify functions coming from libclc.
```

I'd suggest clarifying via a parenthetical what clspv and libclc are.

https://github.com/llvm/llvm-project/pull/92126