Legalize bint.i8

cranelift/filetests/isa/x86/legalize-bint-i8.clif

@@ -0,0 +1,10 @@
+test compile
+
+target x86_64
+
+function u0:0() -> i8 fast {
+ebb0:
+    v14 = bconst.b1 false
+    v15 = bint.i8 v14
+    return v15
+}

lib/codegen/meta-python/base/legalize.py

@@ -257,6 +257,15 @@ for int_ty in [types.i8, types.i16]:
         )
     )
 
+for int_ty in [types.i8, types.i16]:
+    widen.legalize(
+        a << insts.bint.bind(int_ty)(b),
+        Rtl(
+            x << insts.bint.i32(b),
+            a << ireduce.bind(int_ty)(x)
+        )
+    )
+
 # Expand integer operations with carry for RISC architectures that don't have
 # the flags.
 expand.legalize(