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

This reverts commit 34344982a9.

programs/bpf/c/src/bench_alu/bench_alu.c

@@ -0,0 +1,30 @@
+/**
+ * @brief Benchmark program that does work
+ *
+ * Counts Armstrong Numbers between 1 and x
+ */
+
+#include <solana_sdk.h>
+
+extern bool entrypoint(const uint8_t *input) {
+  uint64_t x = *(uint64_t *) input;
+  uint64_t *result = (uint64_t *) input + 1;
+  uint64_t count = 0;
+
+  for (int i = 1; i <= x; i++) {
+    uint64_t temp = i;
+    uint64_t num = 0;
+    while (temp != 0) {
+      uint64_t rem = (temp % 10);
+      num += rem * rem * rem;
+      temp /= 10;
+    }
+    if (i == num) {
+      count++;
+    }
+  }
+
+  sol_log_64(x, count, 0, 0, 0);
+  *result = count;
+  return true;
+}