Add reference types R32 and R64

-Add resumable_trap, safepoint, isnull, and null instructions
-Add Stackmap struct and StackmapSink trait

Co-authored-by: Mir Ahmed <mirahmed753@gmail.com>
Co-authored-by: Dan Gohman <sunfish@mozilla.com>

cranelift/src/compile.rs

@@ -1,6 +1,6 @@
 //! CLI tool to read Cranelift IR files and compile them into native code.
 
-use crate::disasm::{print_all, PrintRelocs, PrintTraps};
+use crate::disasm::{print_all, PrintRelocs, PrintStackmaps, PrintTraps};
 use crate::utils::{parse_sets_and_triple, read_to_string};
 use cranelift_codegen::print_errors::pretty_error;
 use cranelift_codegen::settings::FlagsOrIsa;
@@ -62,11 +62,12 @@ fn handle_module(
 
         let mut relocs = PrintRelocs::new(flag_print);
         let mut traps = PrintTraps::new(flag_print);
+        let mut stackmaps = PrintStackmaps::new(flag_print);
         let mut mem = vec![];
 
         // Compile and encode the result to machine code.
         let code_info = context
-            .compile_and_emit(isa, &mut mem, &mut relocs, &mut traps)
+            .compile_and_emit(isa, &mut mem, &mut relocs, &mut traps, &mut stackmaps)
             .map_err(|err| pretty_error(&context.func, Some(isa), err))?;
 
         if flag_print {
@@ -81,6 +82,7 @@ fn handle_module(
                 code_info.jumptables_size + code_info.rodata_size,
                 &relocs,
                 &traps,
+                &stackmaps,
             )?;
         }
     }