[clang] [llvm] [Clang] Add __builtin_assume_dereferenceable to encode deref assumption. (PR #121789)

[Timm Baeder via cfe-commits]

================
@@ -839,6 +839,12 @@ def BuiltinAssumeAligned : Builtin {
   let Prototype = "void*(void const*, size_t, ...)";
 }
 
+def BuiltinAssumeDereferenceable : Builtin {
+  let Spellings = ["__builtin_assume_dereferenceable"];
+  let Attributes = [NoThrow, Const, Constexpr];
----------------
tbaederr wrote:

This says `Constexpr`, but there's no implementation for that that, and of 
course no tests.

https://github.com/llvm/llvm-project/pull/121789
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