asm.emitCALL_RegDisp (JTOC, VM_Entrypoints.modifyCheckMethod.getOffset());
asm.emitCALL_RegDisp (JTOC, VM_Entrypoints.modifyCheckMethod.getOffsetAsInt());
  static void compileModifyCheck (VM_Assembler asm, int offset) {    if (!VM_Configuration.ExtremeAssertions) return;    // on entry java stack contains ... [SP+offset] -> target_ref    // on exit: stack is the same      asm.emitPUSH_RegDisp(SP, offset);   // dup    genParameterRegisterLoad(asm, 1);    asm.emitCALL_RegDisp (JTOC, VM_Entrypoints.modifyCheckMethod.getOffset());  }