Commits on Jun 13, 2020

1. Optimize rdbEncodeInteger using bit operations …

   use sign extension mov instructions into 8/16/32 bits int registers to check if value fits
   into 8/16/32 bit width.
   ```
   int function(long long value){
       struct SignExtendBits{
           long long bits8: 8;
           long long bits16: 16;
           long long bits32: 32;
       } v;
   
       v.bits8 = value;
       if ( v.bits8 == value ) return 1;
       m.bits16 = value;
       if ( m.bits16 == value ) return 2;
       m.bits32 = value;
       if ( m.bits32 == value ) return 3;
   
       return 0;
   }
   
   Compiles to compact code even with -O1 :
   function(long long):
           movsx rcx, dil
           mov eax, 1
           cmp rcx, rdi
           je .LBB1_3
           movsx rcx, di
           mov eax, 2
           cmp rcx, rdi
           je .LBB1_3
           movsxd rcx, edi
           xor eax, eax
           cmp rcx, rdi
           sete al
           shl eax, 2
   .LBB1_3:
           ret
   ```

   

   tryfinally committed Jun 13, 2020
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