Fix duplicated methods for POSIX platforms.

src/platform-macos.cc

Index: src/platform-macos.cc
diff --git a/src/platform-macos.cc b/src/platform-macos.cc
index 097691be07b01db92e0d1d4a581ced98be366521..30e90bb6144a03b6852c32e9db80d88ecd933429 100644
--- a/src/platform-macos.cc
+++ b/src/platform-macos.cc
@@ -96,11 +96,6 @@ double ceiling(double x) {
 static Mutex* limit_mutex = NULL;
 
 
-void OS::PostSetUp() {
-  POSIXPostSetUp();
-}
-
-
 // We keep the lowest and highest addresses mapped as a quick way of
 // determining that pointers are outside the heap (used mostly in assertions
 // and verification).  The estimate is conservative, i.e., not all addresses in
@@ -126,11 +121,6 @@ bool OS::IsOutsideAllocatedSpace(void* address) {
 }
 
 
-size_t OS::AllocateAlignment() {
-  return getpagesize();
-}
-
-
 // Constants used for mmap.
 // kMmapFd is used to pass vm_alloc flags to tag the region with the user
 // defined tag 255 This helps identify V8-allocated regions in memory analysis
@@ -160,35 +150,6 @@ void* OS::Allocate(const size_t requested,
 }
 
 
-void OS::Free(void* address, const size_t size) {
-  // TODO(1240712): munmap has a return value which is ignored here.
-  int result = munmap(address, size);
-  USE(result);
-  ASSERT(result == 0);
-}
-
-
-void OS::Sleep(int milliseconds) {
-  usleep(1000 * milliseconds);
-}
-
-
-int OS::NumberOfCores() {
-  return sysconf(_SC_NPROCESSORS_ONLN);
-}
-
-
-void OS::Abort() {
-  // Redirect to std abort to signal abnormal program termination
-  abort();
-}
-
-
-void OS::DebugBreak() {
-  asm("int $3");
-}
-
-
 void OS::DumpBacktrace() {
   // If weak link to execinfo lib has failed, ie because we are on 10.4, abort.
   if (backtrace == NULL) return;