[ignition] Expect 'I' for signed bytecode operands

test/cctest/interpreter/bytecode_expectations/IntegerConstants.golden

Index: test/cctest/interpreter/bytecode_expectations/IntegerConstants.golden
diff --git a/test/cctest/interpreter/bytecode_expectations/IntegerConstants.golden b/test/cctest/interpreter/bytecode_expectations/IntegerConstants.golden
index f71907ba4d402348ff5b54ceb066686e2cd54089..1997d02233e6dba6d354c526f94b41d4044c084c 100644
--- a/test/cctest/interpreter/bytecode_expectations/IntegerConstants.golden
+++ b/test/cctest/interpreter/bytecode_expectations/IntegerConstants.golden
@@ -14,7 +14,7 @@ parameter count: 1
 bytecode array length: 8
 bytecodes: [
   /*   30 E> */ B(StackCheck),
-  /*   34 S> */ B(ExtraWide), B(LdaSmi), U32(12345678),
+  /*   34 S> */ B(ExtraWide), B(LdaSmi), I32(12345678),
   /*   51 S> */ B(Return),
 ]
 constant pool: [
@@ -31,9 +31,9 @@ parameter count: 1
 bytecode array length: 12
 bytecodes: [
   /*   30 E> */ B(StackCheck),
-  /*   42 S> */ B(Wide), B(LdaSmi), U16(1234),
+  /*   42 S> */ B(Wide), B(LdaSmi), I16(1234),
                 B(Star), R(0),
-  /*   48 S> */ B(Wide), B(LdaSmi), U16(5678),
+  /*   48 S> */ B(Wide), B(LdaSmi), I16(5678),
   /*   61 S> */ B(Return),
 ]
 constant pool: [
@@ -50,9 +50,9 @@ parameter count: 1
 bytecode array length: 12
 bytecodes: [
   /*   30 E> */ B(StackCheck),
-  /*   42 S> */ B(Wide), B(LdaSmi), U16(1234),
+  /*   42 S> */ B(Wide), B(LdaSmi), I16(1234),
                 B(Star), R(0),
-  /*   48 S> */ B(Wide), B(LdaSmi), U16(1234),
+  /*   48 S> */ B(Wide), B(LdaSmi), I16(1234),
   /*   61 S> */ B(Return),
 ]
 constant pool: [