The ARM Optimizing C/C++ Compiler v15.9.0.STS User's Guide SPNU151K doesn't contain any reference to the Cortex-A9 or Cortex-A15 processor versions.
Therefore, it is not clear if the TI ARM compiler is intended to support the Cortex-A9 or Cortex-A15 processor versions or not.
I found some old threads which say that the TI ARM compiler is not recommended/supported for a Cortex-A9 or Cortex-A15, but it would be useful if the User's Guide made this explicit (given that TI do make devices which use the Cortex-A9 or Cortex-A15).