[wasm] Cleanup output generated by --wasm-fuzzer-gen-test

The output generated by --wasm-fuzzer-gen-test did not pass the
presubmit check:

* There was a trailing whitespace after "body";
* There was a trailing newline at the end;

Additionally the signature of addElementSegment changed at some point
and now also takes a table-index parameter.

R=thibaudm@chromium.org

Bug: v8:10155
Change-Id: I77481b0ac810a0e3ff06df24afa3ae22beaebb77
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2172744Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67476}

src/wasm/function-body-decoder.cc

@@ -154,7 +154,7 @@ bool PrintRawWasmCode(AccountingAllocator* allocator, const FunctionBody& body,
     ++line_nr;
   }
 
-  os << "// body: " << std::endl;
+  os << "// body:" << std::endl;
   if (line_numbers) line_numbers->push_back(kNoByteCode);
   ++line_nr;
   unsigned control_depth = 0;

test/fuzzer/wasm-fuzzer-common.cc

@@ -198,6 +198,7 @@ void GenerateTestCase(Isolate* isolate, ModuleWireBytes wire_bytes,
   }
   for (const WasmElemSegment& elem_segment : module->elem_segments) {
     os << "builder.addElementSegment(";
+    os << elem_segment.table_index << ", ";
     switch (elem_segment.offset.kind) {
       case WasmInitExpr::kGlobalIndex:
         os << elem_segment.offset.val.global_index << ", true";
@@ -258,7 +259,6 @@ void GenerateTestCase(Isolate* isolate, ModuleWireBytes wire_bytes,
     os << "assertThrows(function() { builder.instantiate(); }, "
           "WebAssembly.CompileError);\n";
   }
-  os << "\n";
 }
 
 void WasmExecutionFuzzer::FuzzWasmModule(Vector<const uint8_t> data,