[PATCH v2] RISC-V: Fix type of CFA during stack probe [PR122114]

[PATCH v2] RISC-V: Fix type of CFA during stack probe [PR122114]

Changes since v1:
	- Limit test to rv64.

-->8--

frame.total_size may not be a constant, this patch changes the type of
the stored cfa offset to avoid errors trying to convert the frame size.

	PR target/122114
gcc/ChangeLog:
	* config/riscv/riscv.cc
	(riscv_allocate_and_probe_stack_space): Change initial_cfa_offset
	type.

gcc/testsuite/ChangeLog:
	* gcc.target/riscv/pr122114.c: New test.