[ignition] Expect 'I' for signed bytecode operands

test/cctest/interpreter/bytecode_expectations/PropertyLoads.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
 wrap: no
 test function name: f
 
 ---
 snippet: "
@@ skipping 38 matching lines @@
 ---
 snippet: "
   function f(a) { return a[100]; }
   f({100 : \"test\"});
 "
 frame size: 0
 parameter count: 2
 bytecode array length: 7
 bytecodes: [
   /*   10 E> */ B(StackCheck),
-  /*   16 S> */ B(LdaSmi), U8(100),
+  /*   16 S> */ B(LdaSmi), I8(100),
   /*   24 E> */ B(LdaKeyedProperty), R(arg0), U8(2),
   /*   31 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]
 
 ---
 snippet: "
@@ skipping 20 matching lines @@
   f({\"-124\" : \"test\", name : 123 })
 "
 frame size: 1
 parameter count: 2
 bytecode array length: 14
 bytecodes: [
   /*   10 E> */ B(StackCheck),
   /*   25 S> */ B(Nop),
   /*   25 E> */ B(LdaNamedProperty), R(arg0), U8(0), U8(2),
                 B(Star), R(0),
-  /*   32 S> */ B(LdaSmi), U8(-124),
+  /*   32 S> */ B(LdaSmi), I8(-124),
   /*   40 E> */ B(LdaKeyedProperty), R(arg0), U8(4),
   /*   48 S> */ B(Return),
 ]
 constant pool: [
   ONE_BYTE_INTERNALIZED_STRING_TYPE ["name"],
 ]
 handlers: [
 ]
 
 ---
@@ skipping 1058 matching lines @@
                 B(Star), R(0),
   /* 1566 S> */ B(Ldar), R(arg1),
   /* 1575 E> */ B(Wide), B(LdaKeyedProperty), R16(arg0), U16(258),
   /* 1579 S> */ B(Return),
 ]
 constant pool: [
 ]
 handlers: [
 ]