Fixed all fuzzer targets (some API changes)

fuzz/fuzz_targets/ion.rs

@@ -12,5 +12,5 @@ fuzz_target!(|func: Func| {
     let _ = env_logger::try_init();
     log::debug!("func:\n{:?}", func);
     let env = regalloc2::fuzzing::func::machine_env();
-    let _out = regalloc2::ion::run(&func, &env).expect("regalloc did not succeed");
+    let _out = regalloc2::ion::run(&func, &env, false).expect("regalloc did not succeed");
 });

fuzz/fuzz_targets/ion_checker.rs

@@ -4,11 +4,11 @@
  */
 
 #![no_main]
+use libfuzzer_sys::arbitrary::{Arbitrary, Result, Unstructured};
 use libfuzzer_sys::fuzz_target;
-use libfuzzer_sys::arbitrary::{Arbitrary, Unstructured, Result};
 
-use regalloc2::fuzzing::func::{Func, Options};
 use regalloc2::checker::Checker;
+use regalloc2::fuzzing::func::{Func, Options};
 
 #[derive(Clone, Debug)]
 struct TestCase {
@@ -18,7 +18,9 @@ struct TestCase {
 impl Arbitrary for TestCase {
     fn arbitrary(u: &mut Unstructured) -> Result<TestCase> {
         Ok(TestCase {
-            func: Func::arbitrary_with_options(u, &Options {
+            func: Func::arbitrary_with_options(
+                u,
+                &Options {
                     reused_inputs: true,
                     fixed_regs: true,
                     clobbers: true,
@@ -27,7 +29,8 @@ impl Arbitrary for TestCase {
                     block_params: true,
                     always_local_uses: false,
                     reftypes: true,
-            })?,
+                },
+            )?,
         })
     }
 }
@@ -37,7 +40,7 @@ fuzz_target!(|testcase: TestCase| {
     let _ = env_logger::try_init();
     log::debug!("func:\n{:?}", func);
     let env = regalloc2::fuzzing::func::machine_env();
-    let out = regalloc2::ion::run(&func, &env).expect("regalloc did not succeed");
+    let out = regalloc2::ion::run(&func, &env, true).expect("regalloc did not succeed");
 
     let mut checker = Checker::new(&func);
     checker.prepare(&out);

fuzz/fuzz_targets/ssagen.rs

@@ -37,6 +37,6 @@ impl Arbitrary for TestCase {
 }
 
 fuzz_target!(|t: TestCase| {
-    let cfginfo = CFGInfo::new(&t.f);
+    let cfginfo = CFGInfo::new(&t.f).expect("could not create CFG info");
     validate_ssa(&t.f, &cfginfo).expect("invalid SSA");
 });