Revert "Use the "GC is marking" information in compiler read barriers (ARM, ARM64)."

This reverts commit 1372c9f40df1e47bf775f1466bbb96f472b6b9ed.

This change (along with https://android-review.googlesource.com/#/c/342429/)
creates null pointer dereferences.

Bug: 35780827
Bug: 29516974
Change-Id: I2a9c4d0ad8d2ab870c2e0ddbff32152933c77abe
11 files changed