================
@@ -1074,14 +1074,43 @@ void 
APINotesWriter::Implementation::writeGlobalVariableBlock(
 }
 
 namespace {
+void emitBoundsSafetyInfo(raw_ostream &OS, const BoundsSafetyInfo &BSI) {
+  llvm::support::endian::Writer writer(OS, llvm::endianness::little);
+  uint8_t flags = 0;
+  if (auto kind = BSI.getKind()) {
+    flags |= 0x01;                // 1 bit
+    flags |= (uint8_t)*kind << 1; // 3 bits
----------------
c8ef wrote:

IIRC the current RFC would require us to add support for at most 
`__terminated_by` and `__null_terminated`, which can still fit within 3 bits.

https://github.com/llvm/llvm-project/pull/185257
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