ARM: Purge Arm32Assembler.

Use Thumb2Assembler always. This originated from finding out that
the JNI tests are run using the Arm32Assembler however in real
world Thumb2Assembler is used for JNI. Therefore Arm32Assembler
code is dead except its own tests and the illegitimate use in
JNI tests.

Change-Id: I9ca6b83582bf97149a46690518ccb9312b1a3b68
12 files changed