hdf5_chunking_query_bmr

Fix for HDFFV-10217 infinite loop in H5VM_power2up().
The function H5VM_power2up() returns the next power of 2 for n.
When n exceeds 2^63, it overflows and becomes 0 causing the infinite looping.
The fix ensures that the function checks for n >= 2^63 and returns 0.