Add binary search table to .eh_frame_hdr

The addresses in the search table must be relative to the start
of .eh_frame_hdr which results in yet another pointer type to patch.
I have moved the Patch method back to elf_writer_quick where
it can be specialized to one of the three pointer types.

The .eh_frame_hdr takes around 17% of .eh_frame now.

Change-Id: I4770d1355ded6cdff9489c33380f6b06c4e3f9fe