Revert "Rename programs to instruction_processors (#3789)" (#3824)

This reverts commit 34344982a9.

programs/bpf/c/src/bpf_to_bpf/entrypoint.c

@@ -0,0 +1,14 @@
+/**
+ * @brief Example C-based BPF program that prints out the parameters
+ * passed to it
+ */
+#include <solana_sdk.h>
+
+#include "helper.h"
+
+extern bool entrypoint(const uint8_t *input) {
+  sol_log(__FILE__);
+  helper_function();
+  sol_log(__FILE__);
+  return true;
+}

programs/bpf/c/src/bpf_to_bpf/helper.c

@@ -0,0 +1,11 @@
+/**
+ * @brief Example C-based BPF program that prints out the parameters
+ * passed to it
+ */
+#include <solana_sdk.h>
+
+#include "helper.h"
+
+void helper_function(void) {
+  sol_log(__FILE__);
+}

programs/bpf/c/src/bpf_to_bpf/helper.h

@@ -0,0 +1,7 @@
+/**
+ * @brief Example C-based BPF program that prints out the parameters
+ * passed to it
+ */
+#include <solana_sdk.h>
+
+void helper_function(void);