linux-user: move sparc/sparc64 cpu loop to sparc directory

No code change, only move code from main.c to
sparc/cpu_loop.c.

Include sparc/cpu_loop.c in sparc64/cpu_loop.c
to avoid to duplicate code.

linux-user: move sparc/sparc64 cpu loop to sparc directory

No code change, only move code from main.c to
sparc/cpu_loop.c.

Include sparc/cpu_loop.c in sparc64/cpu_loop.c
to avoid to duplicate code.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180411185651.21351-6-laurent@vivier.eu>

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linux-user: create a dummy per arch cpu_loop.c

Create a cpu_loop-common.h for future use by
these new files and use it in the existing
main.c

Introduce target_cpu_copy_regs():
declare the function

linux-user: create a dummy per arch cpu_loop.c

Create a cpu_loop-common.h for future use by
these new files and use it in the existing
main.c

Introduce target_cpu_copy_regs():
declare the function in cpu_loop-common.h
and an empty function for each target,
to move all the cpu_loop prologues to this function.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180411185651.21351-2-laurent@vivier.eu>

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