[llvm] Add IntrWillReturn to intrinsics (PR #101562)

[Nikita Popov via llvm-commits]

================
@@ -13,11 +13,11 @@
 // Specialized loads from packet
 let TargetPrefix = "bpf" in {  // All intrinsics start with "llvm.bpf."
   def int_bpf_load_byte : ClangBuiltin<"__builtin_bpf_load_byte">,
-              Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrReadMem]>;
+              Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrWillReturn, IntrReadMem]>;
   def int_bpf_load_half : ClangBuiltin<"__builtin_bpf_load_half">,
-              Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrReadMem]>;
+              Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrWillReturn, IntrReadMem]>;
   def int_bpf_load_word : ClangBuiltin<"__builtin_bpf_load_word">,
-              Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrReadMem]>;
+              Intrinsic<[llvm_i64_ty], [llvm_ptr_ty, llvm_i64_ty], [IntrWillReturn, IntrReadMem]>;
----------------
nikic wrote:

These looks like they should use DefaultAttrsIntrinsic instead (unless these are synchronizing loads?)

https://github.com/llvm/llvm-project/pull/101562