Use BB-like EBB in docs/*.clif

cranelift/docs/callex.clif

@@ -4,10 +4,13 @@ function %gcd(i32 uext, i32 uext) -> i32 uext system_v {
     fn0 = %divmod(i32 uext, i32 uext) -> i32 uext, i32 uext
 
 ebb1(v0: i32, v1: i32):
-    brz v1, ebb2
+    brz v1, ebb3
+    jump ebb2
+
+ebb2:
     v2, v3 = call fn0(v0, v1)
     return v2
 
-ebb2:
+ebb3:
     return v0
 }

cranelift/docs/example.clif

@@ -6,11 +6,14 @@ function %average(i32, i32) -> f32 system_v {
 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)
+    brz v1, ebb5                  ; Handle count == 0.
+    jump ebb2
 
-ebb2(v4: i32):
+ebb2:
+    v3 = iconst.i32 0
+    jump ebb3(v3)
+
+ebb3(v4: i32):
     v5 = imul_imm v4, 4
     v6 = iadd v0, v5
     v7 = load.f32 v6              ; array[i]
@@ -20,14 +23,17 @@ ebb2(v4: i32):
     stack_store v10, ss0
     v11 = iadd_imm v4, 1
     v12 = icmp ult v11, v1
-    brnz v12, ebb2(v11)           ; Loop backedge.
+    brnz v12, ebb3(v11)           ; Loop backedge.
+    jump ebb4
+
+ebb4:
     v13 = stack_load.f64 ss0
     v14 = fcvt_from_uint.f64 v1
     v15 = fdiv v13, v14
     v16 = fdemote.f32 v15
     return v16
 
-ebb3:
+ebb5:
     v100 = f32const +NaN
     return v100
 }