[Interpreter] Remove constant pool type in tests

test/cctest/interpreter/bytecode_expectations/GlobalCompoundExpressions.golden

 #
 # Autogenerated by generate-bytecode-expectations.
 #
 
 ---
-pool type: string
 execute: yes
 wrap: no
 test function name: f
 
 ---
 snippet: "
   var global = 1;
   function f() { return global &= 1; }
   f();
 "
 frame size: 1
 parameter count: 1
 bytecode array length: 12
 bytecodes: [
   /*   26 E> */ B(StackCheck),
   /*   31 S> */ B(LdrGlobal), U8(1), R(0),
                 B(BitwiseAndSmi), U8(1), R(0), U8(3),
   /*   45 E> */ B(StaGlobalSloppy), U8(0), U8(4),
   /*   51 S> */ B(Return),
 ]
 constant pool: [
-  "global",
+  ONE_BYTE_INTERNALIZED_STRING_TYPE ["global"],
 ]
 handlers: [
 ]
 
 ---
 snippet: "
   unallocated = 1;
   function f() { return unallocated += 1; }
   f();
 "
 frame size: 1
 parameter count: 1
 bytecode array length: 12
 bytecodes: [
   /*   27 E> */ B(StackCheck),
   /*   32 S> */ B(LdrGlobal), U8(1), R(0),
                 B(AddSmi), U8(1), R(0), U8(3),
   /*   51 E> */ B(StaGlobalSloppy), U8(0), U8(4),
   /*   57 S> */ B(Return),
 ]
 constant pool: [
-  "unallocated",
+  ONE_BYTE_INTERNALIZED_STRING_TYPE ["unallocated"],
 ]
 handlers: [
 ]