struct Entry

Definition for large and small trace entries.

TODO(johngro): Change the string literal and FileFuncLineInfo pointers

contained in these structures so that they are offsets from the base of the

kernel image, instead of being absolute pointers.

In theory, this might same some storage (if a 32 bit offset can be used

instead of a 64 bit pointer), but it may also become a more hard requirement

for persistent traces once kernel images start to be loaded in different

locations on every boot because of ASLR.