[liftoff] Do not store any relocation info

Liftoff code is never relocated and never serialized, thus relocation
information is not needed.

This results in slightly less information being printed when
disassembling code, because the disassembler sometimes uses relocation
information to show the kind of a call (e.g. internal wasm call vs.
builtin call). This is an acceptable regression IMO.

R=thibaudm@chromium.org

Bug: v8:10777
Change-Id: I019913a41b47466fba7b7f216ab51b91475cd984
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2412186Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69939}

src/wasm/wasm-code-manager.cc

@@ -1064,6 +1064,10 @@ std::unique_ptr<WasmCode> NativeModule::AddCodeWithCodeSpace(
   // Flush the i-cache after relocation.
   FlushInstructionCache(dst_code_bytes.begin(), dst_code_bytes.size());
 
+  // Liftoff code will not be relocated or serialized, thus do not store any
+  // relocation information.
+  if (tier == ExecutionTier::kLiftoff) reloc_info = {};
+
   std::unique_ptr<WasmCode> code{new WasmCode{
       this, index, dst_code_bytes, stack_slots, tagged_parameter_slots,
       safepoint_table_offset, handler_table_offset, constant_pool_offset,