[llvm-objcopy] Apply encryptable offset to first segment, not section (#130517)

Bug introduced #120995. The LLD code calculates the "size" of the Mach-O
headers, and then uses that size to place the segments, but the `__TEXT`
section stays at `fileoff` zero. When I wrote the code into llvm-objcopy
I calculated the extra space into the initial offset, which moved all
the sections back 1 page.

Besides the modified test checking for the right `fileoff` values of the
sections and the segments, I also manually checked the generated
binaries after `llvm-objcopy` using `dyld_info`, as the bug report
suggested.

Fixes #130472

0 files changed, 0 insertions, 0 deletions