[RegisterScavenger][RISCV] Don't search for FrameSetup instrs if we were...

[RegisterScavenger][RISCV] Don't search for FrameSetup instrs if we were searching from Non-FrameSetup instrs

Otherwise, the spill position may point to position where before
FrameSetup instructions. In which case, the spill instruction may store
to caller's frame since the stack pointer has not been adjustted.

Fixes https://github.com/llvm/llvm-project/issues/58286

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D135693