- This optimization will adjust stack, but it not check/update other
   stack pointer use-site, the example is when the arguments put on
   stack, the offset become wrong after optimization.

 - However adjust stack frame usage after register allocation could be
   error prone, so we decide to turn off this optimization for such case.

 - Ye-Ting Kuo report this issue on github:
   https://github.com/riscv/riscv-gcc/pull/192

gcc/ChangeLog:

	* config/riscv/riscv-sr.c (riscv_remove_unneeded_save_restore_calls):
	Abort if any arguments on stack.

gcc/testsuite/ChangeLog

	* gcc.target/riscv/save-restore-9.c: New.

(cherry picked from commit 4c0d1322033ce979532425d336530b217f6b5fd3)