Revert of Check for semaphore alignment on posix platforms. (patchset #1 id:1...

Revert of Check for semaphore alignment on posix platforms. (patchset #1 id:1 of https://codereview.chromium.org/1912923003/ )

Reason for revert:
blocks rolling. See https://bugs.chromium.org/p/chromium/issues/detail?id=605349 for more information.

This CL only triggers the problem earlier but is not the culprit.

The real bug is under investigation by the GC team.

Original issue's description:
> Check for semaphore alignment on posix platforms.
>
> BUG=chromium:605349
> LOG=NO
>
> Committed: https://crrev.com/8d24472acfaf7e67ca20106cb1f405fc0590c849
> Cr-Commit-Position: refs/heads/master@{#35717}

TBR=mlippautz@chromium.org,ulan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:605349
LOG=N

Review URL: https://codereview.chromium.org/1921533002

Cr-Commit-Position: refs/heads/master@{#35755}

src/base/platform/semaphore.cc

@@ -74,13 +74,6 @@ bool Semaphore::WaitFor(const TimeDelta& rel_time) {
 #elif V8_OS_POSIX
 
 Semaphore::Semaphore(int count) {
-  // The sem_init() does not check for alignment of the native handle.
-  // Unaligned native handle can later cause a failure in semaphore signal.
-  // Check the alignment here to catch the failure earlier.
-  // Context: crbug.com/605349.
-  const uintptr_t kPointerAlignmentMask = sizeof(void*) - 1;
-  CHECK_EQ(
-      0, reinterpret_cast<uintptr_t>(&native_handle_) & kPointerAlignmentMask);
   DCHECK(count >= 0);
 #if V8_LIBC_GLIBC
   // sem_init in glibc prior to 2.1 does not zero out semaphores.