Add check to CheckImageIdenticalToOriginalExceptForRelocation

Add defensive check which fails gracefully if the
relocation offset is larger than the image size.

Add tests.

(cherry picked from commit b16e4a3c)

Fix patchoat_test for heap poisoning

The test was disabled for heap poisoning; keep it disabled.

The TEST_DISABLED_FOR_HEAP_POISONING macro is in fact just
a conditional return, and I didn't account for it properly.

(cherry picked from commit 23ae5322)

Bug: 109677607
Test: test-art-host-gtest-patchoat_test SANITIZE_HOST=address
Test: test-art-host-gtest-patchoat_test ART_HEAP_POISONING=true

Merged-In: Ic989d5b7c77fd66e77b9e8ba90df1bf490a46e43
Merged-In: I40266d0a06102e4d8bc52357b884b0e7d9fd2630
Change-Id: If2c83bee3c19eb9d53154d35fcaf0b3edf152872