de-rust phase-0: archive Rust LLVM backend to archive/rust-llvm-backend (RESTORE documented); defaults unaffected

archive/rust-llvm-backend/llvm/compiler/codegen/instructions/string_ops.rs

@@ -0,0 +1,19 @@
+use inkwell::values::{IntValue, PointerValue};
+
+/// Lightweight newtypes for string representations used in lowering.
+/// StrHandle crosses basic blocks; StrPtr is created at call sites within the same block.
+pub struct StrHandle<'ctx>(pub IntValue<'ctx>);
+pub struct StrPtr<'ctx>(pub PointerValue<'ctx>);
+
+impl<'ctx> StrHandle<'ctx> {
+    #[inline]
+    pub fn as_i64(&self) -> IntValue<'ctx> {
+        self.0
+    }
+}
+
+impl<'ctx> From<PointerValue<'ctx>> for StrPtr<'ctx> {
+    fn from(p: PointerValue<'ctx>) -> Self {
+        Self(p)
+    }
+}