The first row of a pyramid can have a larger location delta than the
following, because there can be other things than a push between the
function entry point and the first push
clang generates tables like this
LOC CFA rbx rbp r14 r15 ra
00000000000028a0 rsp+8 u u u u c-8
00000000000028a1 rsp+16 u u u u c-8
00000000000028a3 rsp+24 u u u u c-8
00000000000028a5 rsp+32 u u u u c-8
00000000000028a6 rsp+40 u u u u c-8
00000000000028aa rsp+64 c-40 c-16 c-32 c-24 c-8
