[riscv64] Delete extra define

Change-Id: Ieb986b9e17103ec24ca98a7ab44e7bef9caa6bfa
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3194013Reviewed-by: ji qiu <qiuji@iscas.ac.cn>
Commit-Queue: ji qiu <qiuji@iscas.ac.cn>
Cr-Commit-Position: refs/heads/main@{#77136}

src/codegen/riscv64/macro-assembler-riscv64.cc

@@ -4479,7 +4479,6 @@ void TurboAssembler::SmiUntag(Register dst, const MemOperand& src) {
 }
 
 void TurboAssembler::SmiToInt32(Register smi) {
-  DCHECK(smi.Is64Bits());
   if (FLAG_enable_slow_asserts) {
     AssertSmi(smi);
   }

src/codegen/riscv64/macro-assembler-riscv64.h

@@ -1255,9 +1255,6 @@ class V8_EXPORT_PRIVATE MacroAssembler : public TurboAssembler {
   // Jump if the register contains a non-smi.
   void JumpIfNotSmi(Register value, Label* not_smi_label);
 
-  // Abort execution if argument is a smi, enabled via --debug-code.
-  void AssertNotSmi(Register object);
-  void AssertSmi(Register object);
 
   // Abort execution if argument is not a Constructor, enabled via --debug-code.
   void AssertConstructor(Register object);