[BOLT,test] Make linker scripts less sensitive to lld's orphan placement (#93763)

Then two tests rely on .interp being the first section.
llvm-bolt would crash if lld places .interp after .got
(f639b57f).

For best portability, when a linker scripts specifies a SECTIONS
command, the first section for each PT_LOAD segment should be specified
with a MAXPAGESIZE alignment. Otherwise, linkers have freedom to decide
how to place orphan sections, which might break intention.