Fix 0027c834

FLAG_runtime_stats was declared as Int but it was accessed as
pointer. On 64-bit architectures pointer access needs to be
eight byte aligned. This created unaligned memory access
on 64-bit architectures for those architectures that do not
support unaligned memory access.

TEST=mjsunit/wasm/table,cctest/test-accessors/AccessorIC

Change-Id: I569b69583de98b4c5fb7266f23f927bbd006966d
Reviewed-on: https://chromium-review.googlesource.com/1177601
Commit-Queue: Ivica Bogosavljevic <ibogosavljevic@wavecomp.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55166}