PR target/49437
       * config/arm/arm.c (arm_output_epilogue): Properly handle epilogue
       when stack was realigned in interrupt handler prologue.

testsuite:

       PR target/49437
       * gcc.target/arm/handler-align.c: New test.
       * lib/target-supports.exp (check_effective_target_arm_cortex_m):
         New Function.

From-SVN: r177891