Clean up usage of 32 bit/64 bit checks.

Rather than have to create a number of #if defines for the memory
dumping parts of the tombstone, create a single function to generate
these strings for the memory tests.

Make CrasherTest.smoke use a regex that passes on 32 bit and 64 bit.

Make the tests page size agnostic.

Bug: 339017792

Test: Treehugger.
Test: Ran 32 bit and 64 bit versions of tests on a real device.
Test: Ran on the aosp_cf_x86_64_phone_pgagnostic-trunk_staging-userdebug
Change-Id: If9365061b85de23b00a1bf947d85923cde06c068