Method pow2

Source/external/fast_float.h:2390–2392

multiply as if by 2 raised to a power.

  // multiply as if by 2 raised to a power.
  FASTFLOAT_CONSTEXPR20 bool pow2(uint32_t exp) noexcept {
	return shl(exp);
  }

  // multiply as if by 5 raised to a power.
  FASTFLOAT_CONSTEXPR20 bool pow5(uint32_t exp) noexcept {