bench: indirect call benchmark

test/benchmarks/micro/icall_hash.c

@@ -0,0 +1,27 @@
+#include <stdint.h>
+
+#define WASM_EXPORT __attribute__((visibility("default")))
+
+static uint64_t fnv1(uint64_t state, uint64_t input)
+{
+    return (state ^ input) * 0x100000001b3;
+}
+
+static uint64_t threeab(uint64_t state, uint64_t input)
+{
+    return (3 * state) + input;
+}
+
+typedef uint64_t (*hashfn)(uint64_t state, uint64_t input);
+
+static hashfn fns[] = {fnv1, threeab};
+
+WASM_EXPORT unsigned icall(unsigned steps)
+{
+    uint64_t input = 0x1234567890abcdef;
+
+    uint64_t state = 0xcbf29ce484222325;
+    for (unsigned i = 0; i < steps; i++)
+        state = fns[i % 2](state, input);
+    return state;
+}

test/benchmarks/micro/icall_hash.inputs

@@ -0,0 +1,7 @@
+1000_steps
+icall
+i:i
+1000
+
+3242341221
+