Commits on Jan 16, 2020

1. Fixes UB in pcl::poisson::OctNode …

   Example
   
   ```cpp
   /// Must be compiled with -fsanitze=undefined
   #include <iostream>
   #include <stdio.h>
   
   long long _InterleaveBits( int p[3] )
   {
     long long key = 0;
     for( int i=0 ; i<32 ; i++ ) 
     {
       key |= ( ( p[0] & (1<<i) )<<(2*i) ) | ( ( p[1] & (1<<i) )<<(2*i+1) ) | ( ( p[2] & (1<<i) )<<(2*i+2) );
     }
     return key;
   }
   
   long long _FixedInterleaveBits( int _p[3] )
   {
     long long key = 0;
     long long p[3] = {_p[0],_p[1],_p[2]};
     for( int i=0 ; i<31 ; i++ ) 
     {
       key |= ( ( p[0] & (1ull<<i) )<<(2*i) ) | ( ( p[1] & (1ull<<i) )<<(2*i+1) ) | ( ( p[2] & (1ull<<i) )<<(2*i+2) );
     }
     return key;
   }
   
   int main() {
     int p[3] = {0,255,128};
     std::cout << _InterleaveBits(p) << std::endl;
     std::cout << _FixedInterleaveBits(p) << std::endl;
   }
   ```

   

   RLThomaz committed Jan 16, 2020
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