x64: Migrate trapif and trapff to ISLE (#4545)

https://github.com/bytecodealliance/wasmtime/pull/4545

cranelift/codegen/src/machinst/isle.rs

@@ -144,6 +144,11 @@ macro_rules! isle_prelude_methods {
             }
         }
 
+        #[inline]
+        fn mark_value_used(&mut self, val: Value) {
+            self.lower_ctx.increment_lowered_uses(val);
+        }
+
         #[inline]
         fn put_in_reg(&mut self, val: Value) -> Reg {
             self.lower_ctx.put_value_in_regs(val).only_reg().unwrap()

cranelift/codegen/src/machinst/lower.rs

@@ -141,6 +141,8 @@ pub trait LowerCtx {
     /// Resolves a particular input of an instruction to the `Value` that it is
     /// represented with.
     fn input_as_value(&self, ir_inst: Inst, idx: usize) -> Value;
+    /// Increment the reference count for the Value, ensuring that it gets lowered.
+    fn increment_lowered_uses(&mut self, val: Value);
     /// Put the `idx`th input into register(s) and return the assigned register.
     fn put_input_in_regs(&mut self, ir_inst: Inst, idx: usize) -> ValueRegs<Reg>;
     /// Put the given value into register(s) and return the assigned register.
@@ -1362,6 +1364,10 @@ impl<'func, I: VCodeInst> LowerCtx for Lower<'func, I> {
         NonRegInput { inst, constant }
     }
 
+    fn increment_lowered_uses(&mut self, val: Value) {
+        self.value_lowered_uses[val] += 1
+    }
+
     fn put_input_in_regs(&mut self, ir_inst: Inst, idx: usize) -> ValueRegs<Reg> {
         let val = self.f.dfg.inst_args(ir_inst)[idx];
         self.put_value_in_regs(val)