cranelift: CLIF Fuzzer generate multiple blocks

cranelift/fuzzgen/src/config.rs

@@ -9,6 +9,13 @@ pub struct Config {
     /// Number of variables that we allocate per function
     /// This value does not include the signature params
     pub vars_per_function: RangeInclusive<usize>,
+    /// Number of blocks that we generate per function.
+    /// This value does not include the entry block
+    pub blocks_per_function: RangeInclusive<usize>,
+    /// Number of params a block should take
+    /// This value does not apply to block0 which takes the function params
+    /// and is thus governed by `signature_params`
+    pub block_signature_params: RangeInclusive<usize>,
 }
 
 impl Default for Config {
@@ -19,6 +26,8 @@ impl Default for Config {
             signature_rets: 0..=16,
             instructions_per_block: 0..=64,
             vars_per_function: 0..=16,
+            blocks_per_function: 0..=16,
+            block_signature_params: 0..=16,
         }
     }
 }