[riscv64] [deoptimizer] Remove soft deopts

Port 1ff685d8

Change-Id: Ie60f3b9258114564d3e6a20a0049552694003d52
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3573783
Auto-Submit: Yahan Lu <yahan@iscas.ac.cn>
Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
Commit-Queue: ji qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#79791}

src/builtins/riscv64/builtins-riscv64.cc

@@ -3667,10 +3667,6 @@ void Builtins::Generate_DeoptimizationEntry_Eager(MacroAssembler* masm) {
   Generate_DeoptimizationEntry(masm, DeoptimizeKind::kEager);
 }
 
-void Builtins::Generate_DeoptimizationEntry_Soft(MacroAssembler* masm) {
-  Generate_DeoptimizationEntry(masm, DeoptimizeKind::kSoft);
-}
-
 void Builtins::Generate_DeoptimizationEntry_Lazy(MacroAssembler* masm) {
   Generate_DeoptimizationEntry(masm, DeoptimizeKind::kLazy);
 }