[PATCH] aarch64 simulator support

[Jim Wilson]

I started with the arm-sim.exp file and modified it to make it work
for aarch64.  The libgloss.exp patch is to make a big-endian
aarch64_be-elf target work.  I just submitted a gdb simulator patch
for big-endian support.

With this dejagnu support, running the gcc C language testsuite for an
aarch64-elf build, I get

                === gcc Summary ===

# of expected passes            35433
# of unexpected failures        254
# of unsupported tests          131

which is pretty good.

Jim

dej-aarch64-sim.patch
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