Cintex: add support for hard-coded ARMv7 trampolines

Add ARMv7 ARM mode hard-coded trampolines for Cintex.

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
configure: Enable Cintex on ARMv7 (linuxarm)

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Add support for ARMv8 64-bit (AArch64), linuxarm64

Add support for AArch64 architecture. Introduces new ROOT build
target -- linuxarm64. CINT is functional, but genreflex is not
capable of generating Reflex dictionaries on AArch64 due to old
version of GCC used in GCCXML. Data model -- LP64 -- used by
x86_64 and aarch64 allows pre-generating Reflex dictionaries on
x86_64. This works if software stack is kept the same (e.g,
libstdc++).

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Tested-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Allocate_1arg_function: fix incorrect offset

Resolve long-standing bug where incorrect offset is being used in
Allocate_1arg_function for method address.

Signed-off-by: David Abdurachmanov <David.Abdurachmanov@cern.ch>
Merge ARMv7 32-bit and ARMv8 64-bit (AArch64) support, by David Abdurachmanov!