Add solana-program-runtime crate (#19438)

program-runtime/src/lib.rs

@@ -0,0 +1,8 @@
+#![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
+#![allow(clippy::integer_arithmetic)]
+
+mod instruction_processor;
+mod native_loader;
+
+pub use instruction_processor::*;
+pub use native_loader::*;