RFInclusion into Icedtea6 1.7.1 Thumb2 JIT and ARM ASM bugfixes

[Xerxes Rånby]

Hi i suggest that we should add the ARM Thumb2 JIT and ARM ASM bugfixes
into the Icedtea6 1.7.1 release

http://icedtea.classpath.org/hg/icedtea6/rev/748156804502 - Make Thumb2
JIT the default build
http://icedtea.classpath.org/hg/icedtea6/rev/ba5d4644582d - Several bug
fixes to compiling methods with exception handlers
http://icedtea.classpath.org/hg/icedtea6/rev/ab2479dd2f87 - Various bug
fixes
http://icedtea.classpath.org/hg/icedtea6/rev/59e6d2d51c8e - Add
ports/hotspot/src/cpu/zero/vm/thumb2.cpp missed out in last commit
http://icedtea.classpath.org/hg/icedtea6/rev/b227a81ef16c - Added Thumb2
JIT + general tidying up
http://icedtea.classpath.org/hg/icedtea6/rev/be36bffde64d - Fix build
for hs16. Add implementation of is_allocatable

Ok to merge into Icedtea6 1.7.1?

Icedtea6 1.7 contains one fix that cant be found in the Icedtea6 trunk
http://icedtea.classpath.org/hg/release/icedtea6-1.7/rev/06d8ceaf70ff
Would this changeset cause any issues?
Should this changeset be transplanted to the Icedtea6 main branch?

Cheers
Xerxes