[ignition] Expect 'I' for signed bytecode operands

test/cctest/interpreter/bytecode_expectations/Delete.golden

Index: test/cctest/interpreter/bytecode_expectations/Delete.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/Delete.golden b/test/cctest/interpreter/bytecode_expectations/Delete.golden
index e139fd65d14db2275caa37d2bd037ff6482c7366..0f891ced42adf4a76acc8c2a0c7191357a2f7bad 100644
--- a/test/cctest/interpreter/bytecode_expectations/Delete.golden
+++ b/test/cctest/interpreter/bytecode_expectations/Delete.golden
@@ -60,7 +60,7 @@ bytecodes: [
   /*   30 E> */ B(StackCheck),
   /*   42 S> */ B(CreateObjectLiteral), U8(0), U8(0), U8(1), R(1),
                 B(Mov), R(1), R(0),
-  /*   56 S> */ B(LdaSmi), U8(2),
+  /*   56 S> */ B(LdaSmi), I8(2),
                 B(DeletePropertySloppy), R(0),
   /*   76 S> */ B(Return),
 ]
@@ -79,7 +79,7 @@ parameter count: 1
 bytecode array length: 7
 bytecodes: [
   /*   30 E> */ B(StackCheck),
-  /*   42 S> */ B(LdaSmi), U8(10),
+  /*   42 S> */ B(LdaSmi), I8(10),
                 B(Star), R(0),
   /*   46 S> */ B(LdaFalse),
   /*   63 S> */ B(Return),
@@ -109,7 +109,7 @@ bytecodes: [
   /*   64 S> */ B(CreateClosure), U8(1), U8(2), U8(2),
   /*   93 S> */ B(LdaCurrentContextSlot), U8(4),
                 B(Star), R(1),
-                B(LdaSmi), U8(1),
+                B(LdaSmi), I8(1),
                 B(DeletePropertyStrict), R(1),
   /*  113 S> */ B(Return),
 ]