add GosCompatMemoryTests

[inthewaves]

Adds tests that runs a /proc/self/smaps streaming parser with memory allocations for each VMA based on GrapheneOS/os-issue-tracker#7916. The test is run with hardened_malloc disabled as a control and run with hardened_malloc enabled. Tests will stop at a high limit of VMAs rather than go until an out of memory error / low memory killer is invoked

Current failure also prints out a histogram of VMAs:

signal 6 (SIGABRT), code -1 (SI_QUEUE)
abort message: simple_smaps_parser guard abort after element allocation guard: accepted_vma_records=16385 max_accepted_vma_records=16384 bytes_allocated=31457360 max_bytes_allocated=201326592
memory mappings:
  total=18975
  18726 [anon:malloc 96]
  50 [anon:malloc slab region gap]
  23 <anonymous>
  17 [anon:malloc allocator_state]
  13 [anon:.bss]
  13 [anon:bionic_alloc_small_objects]
  7 [anon:cfi shadow]
  7 [page size compat]
  4 /apex/com.android.runtime/bin/linker64
  4 /apex/com.android.runtime/lib64/bionic/libc.so
  4 /apex/com.android.runtime/lib64/bionic/libm.so
  4 /data/local/tmp/goscompat_smaps_native_runner
  ... 76 more mapping names

The test purposely makes 80-byte allocations for each VMA, so adding the 8-byte canary leads to 88 bytes and rounded up to the 96-byte class