[wasm] Avoid overallocation of far jump table

On platforms that do not require the far jump table for wasm calls (32
bit platforms currently), we do not need to include a far jump table
slot per wasm function. Other places already used the
{NumWasmFunctionsInFarJumpTable} helper function, but in the actual
allocation of the far jump table, it was missing.

R=jkummerow@chromium.org

Change-Id: I30734a1a25cc80e38c47abfd39059d56c9e5de57
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1910101Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64911}

src/wasm/wasm-code-manager.cc

@@ -1254,7 +1254,8 @@ void NativeModule::AddCodeSpace(
   int num_function_slots = NumWasmFunctionsInFarJumpTable(num_wasm_functions);
   far_jump_table = CreateEmptyJumpTableInRegion(
       JumpTableAssembler::SizeForNumberOfFarJumpSlots(
-          WasmCode::kRuntimeStubCount, num_function_slots),
+          WasmCode::kRuntimeStubCount,
+          NumWasmFunctionsInFarJumpTable(num_function_slots)),
       region, allocator_lock);
   CHECK(region.contains(far_jump_table->instruction_start()));
   EmbeddedData embedded_data = EmbeddedData::FromBlob();