[riscv] Port [wasm][liftoff] Fix and cleanup tracing of return value

Port commit 6f9e71f

Change-Id: Id5226e0892f67573cea289040c2d5aa85f159478
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3886478
Commit-Queue: ji qiu <qiuji@iscas.ac.cn>
Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#83122}

src/wasm/baseline/riscv/liftoff-assembler-riscv.h

@@ -157,6 +157,10 @@ void LiftoffAssembler::PatchPrepareStackFrame(
   GenPCRelativeJump(kScratchReg, imm32);
 }
 
+void LiftoffAssembler::LoadSpillAddress(Register dst, int offset) {
+  SubWord(dst, fp, offset);
+}
+
 void LiftoffAssembler::FinishCode() { ForceConstantPoolEmissionWithoutJump(); }
 
 void LiftoffAssembler::AbortCompilation() { AbortedCodeGeneration(); }