[riscv][wasm] Fix OOL spill space size in RecordSpillsInSafepoint

PushRegisters spills GP (8 bytes), FP (8 bytes) and SIMD (16 bytes)
registers, but RecordSpillsInSafepoint accounted FP registers as
kSimd128Size and ignored SIMD registers entirely. This made
ool_spill_space_size_ inconsistent with the actual stack layout,
misplacing the boundary between spill slots and outgoing stack
parameters for the GC stack walker.

Fixed: 515449696
Change-Id: Ie8cba9237651badc93ddab4b7f78936f7e259406
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8436642
Reviewed-by: Ji Qiu <qiuji@iscas.ac.cn>
Commit-Queue: Yahan Lu (LuYahan) <yahan@iscas.ac.cn>
Auto-Submit: Yahan Lu (LuYahan) <yahan@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#110009}