[wasm] Small cleanup in WasmCompiledModule::Reset()

Originally the call to RelocatableMemoryReferences() in
WasmCompiledModule::Reset() was guarded behind a condition.This
condition, however, is redundant, because it is checked later
again when the code is patched. This CL removes the check in
WasmCompiledModule::Reset().

R=clemensh@chromium.org

Change-Id: I10d277072f2223c2e067789a1efc3bd259f0ce5e
Reviewed-on: https://chromium-review.googlesource.com/640709
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47679}

src/wasm/wasm-objects.cc

@@ -965,10 +965,8 @@ void WasmCompiledModule::Reset(Isolate* isolate,
     Zone specialization_zone(isolate->allocator(), ZONE_NAME);
     CodeSpecialization code_specialization(isolate, &specialization_zone);
 
-    if (old_mem_size != default_mem_size || old_mem_start != nullptr) {
     code_specialization.RelocateMemoryReferences(old_mem_start, old_mem_size,
                                                  nullptr, default_mem_size);
-    }
 
     if (compiled_module->has_globals_start()) {
       Address globals_start =