[lld-macho][nfc]Add bounds on sections and subsections check before attempting...

[lld-macho][nfc]Add bounds on sections and subsections check before attempting to dereferencing iterators.

Runnign some tests with asan built of LLD would throw errors similar to the following:

AddressSanitizer:DEADLYSIGNAL
    #0 0x55d8e6da5df7 in operator() /mnt/ssd/repo/lld/llvm-project/lld/MachO/Arch/ARM64.cpp:612
    #1 0x55d8e6daa514 in operator() /mnt/ssd/repo/lld/llvm-project/lld/MachO/Arch/ARM64.cpp:650

Differential Revision: https://reviews.llvm.org/D157027