Rename Cretonne to Cranelift!

cranelift/docs/example.clif

@@ -0,0 +1,33 @@
+test verifier
+
+function %average(i32, i32) -> f32 system_v {
+    ss0 = explicit_slot 8         ; Stack slot for ``sum``.
+
+ebb1(v0: i32, v1: i32):
+    v2 = f64const 0x0.0
+    stack_store v2, ss0
+    brz v1, ebb3                  ; Handle count == 0.
+    v3 = iconst.i32 0
+    jump ebb2(v3)
+
+ebb2(v4: i32):
+    v5 = imul_imm v4, 4
+    v6 = iadd v0, v5
+    v7 = load.f32 v6              ; array[i]
+    v8 = fpromote.f64 v7
+    v9 = stack_load.f64 ss0
+    v10 = fadd v8, v9
+    stack_store v10, ss0
+    v11 = iadd_imm v4, 1
+    v12 = icmp ult v11, v1
+    brnz v12, ebb2(v11)           ; Loop backedge.
+    v13 = stack_load.f64 ss0
+    v14 = fcvt_from_uint.f64 v1
+    v15 = fdiv v13, v14
+    v16 = fdemote.f32 v15
+    return v16
+
+ebb3:
+    v100 = f32const +NaN
+    return v100
+}