Alex Bradbury 8a70468a27 [RISCV] Only mark fp as reserved if the function has a dedicated frame pointer ...

This follows similar logic in the ARM and Mips backends, and allows the free
use of s0 in functions without a dedicated frame pointer. The changes in
callee-saved-gprs.ll most clearly show the effect of this patch.

llvm-svn: 356063

2019-03-13 16:33:45 +00:00

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