[asm.js] Re-enable asm-wasm translation timer

This timer is disabled since the switch to the new validator.
This CL brings it back.

R=mstarzinger@chromium.org

Change-Id: Ie454af72205564d6fec05dd4b7b44c1e3d0c37d6
Reviewed-on: https://chromium-review.googlesource.com/505610Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45300}

src/asmjs/asm-js.cc

@@ -118,6 +118,9 @@ MaybeHandle<FixedArray> AsmJs::CompileAsmViaWasm(CompilationInfo* info) {
   asm_wasm_timer.Start();
   size_t asm_wasm_zone_start = info->zone()->allocation_size();
   {
+    HistogramTimerScope asm_wasm_time_scope(
+        info->isolate()->counters()->asm_wasm_translation_time());
+
     wasm::AsmJsParser parser(info->isolate(), info->zone(), info->script(),
                              info->literal()->start_position(),
                              info->literal()->end_position());