ARM long branch stub: thumb

[Christophe LYON]

Hi,

Another small set of fixes in the ARM long branch stubs: this patch 
makes use of the "Thumb mode only" stub in cases where the BLX 
instruction is not available.

It includes fixes in the testsuite:
- 2 non-EABI tests now expected to pass
- one EABI test now expected to pass
- a few of the XFAIL tests had incorrect name and/or ld flags, so I 
fixed this.

In arm-elf.exp, I changed the address of section .foo (was 0x40100c, now 
0x100100c) to have it be the same in EABI and non-EABI tests, and 
because in the non-EABI case, it was not far enough to need the stub 
(more precisely, after inserting the stub, the call point became close 
enough to its target).

Christophe.
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