[C++] avoid tail call based on different compiler

// BLOCK_TAIL_CALL_OPTIMIZATION
//
// Instructs the compiler to avoid optimizing tail-call recursion. This macro is
// useful when you wish to preserve the existing function order within a stack
// trace for logging, debugging, or profiling purposes.
//
// Example:
//
//   int f() {
//     int result = g();
//     BLOCK_TAIL_CALL_OPTIMIZATION();
//     return result;
//   }
#if defined(__pnacl__)
#define BLOCK_TAIL_CALL_OPTIMIZATION() if (volatile int x = 0) { (void)x; }
#elif defined(__clang__)
// Clang will not tail call given inline volatile assembly.
#define BLOCK_TAIL_CALL_OPTIMIZATION() __asm__ __volatile__("")
#elif defined(__GNUC__)
// GCC will not tail call given inline volatile assembly.
#define BLOCK_TAIL_CALL_OPTIMIZATION() __asm__ __volatile__("")
#elif defined(_MSC_VER)
#include 
// The __nop() intrinsic blocks the optimisation.
#define ABSL_BLOCK_TAIL_CALL_OPTIMIZATION() __nop()
#else
#define ABSL_BLOCK_TAIL_CALL_OPTIMIZATION() \
  if (volatile int x = 0) {                 \
    (void)x;                                \
  }
#endif