Fix duplicated methods for POSIX platforms.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 613d2434b9b8dfc8b580fab57c89bb3e35399906..438de226297bffebeff48e36b5d4a05475645112 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -88,11 +88,6 @@ double ceiling(double x) {
 static Mutex* limit_mutex = NULL;
 
 
-void OS::PostSetUp() {
-  POSIXPostSetUp();
-}
-
-
 uint64_t OS::CpuFeaturesImpliedByPlatform() {
   return 0;  // Linux runs on anything.
 }
@@ -384,11 +379,6 @@ bool OS::IsOutsideAllocatedSpace(void* address) {
 }
 
 
-size_t OS::AllocateAlignment() {
-  return sysconf(_SC_PAGESIZE);
-}
-
-
 void* OS::Allocate(const size_t requested,
                    size_t* allocated,
                    bool is_executable) {
@@ -407,49 +397,6 @@ 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) {
-  unsigned int ms = static_cast<unsigned int>(milliseconds);
-  usleep(1000 * ms);
-}
-
-
-int OS::NumberOfCores() {
-  return sysconf(_SC_NPROCESSORS_ONLN);
-}
-
-
-void OS::Abort() {
-  // Redirect to std abort to signal abnormal program termination.
-  if (FLAG_break_on_abort) {
-    DebugBreak();
-  }
-  abort();
-}
-
-
-void OS::DebugBreak() {
-// TODO(lrn): Introduce processor define for runtime system (!= V8_ARCH_x,
-//  which is the architecture of generated code).
-#if (defined(__arm__) || defined(__thumb__))
-  asm("bkpt 0");
-#elif defined(__mips__)
-  asm("break");
-#elif defined(__native_client__)
-  asm("hlt");
-#else
-  asm("int $3");
-#endif
-}
-
-
 void OS::DumpBacktrace() {
   // backtrace is a glibc extension.
 #if defined(__GLIBC__) && !defined(__UCLIBC__)