Rename gdb.reverse/aarch64.{exp,c} to gdb.reverse/insn-reverse.{exp,c}

gdb/testsuite:

2016-02-26  Yao Qi  <yao.qi@linaro.org>

	* gdb.reverse/aarch64.c: Rename to ...
	* gdb.reverse/insn-reverse.c: ... it.
	* gdb.reverse/aarch64.exp: Rename to ...
	* gdb.reverse/insn-reverse.exp: ... it.

gdb/testsuite/ChangeLog

+2016-02-26  Yao Qi  <yao.qi@linaro.org>
+
+	* gdb.reverse/aarch64.c: Rename to ...
+	* gdb.reverse/insn-reverse.c: ... it.
+	* gdb.reverse/aarch64.exp: Rename to ...
+	* gdb.reverse/insn-reverse.exp: ... it.
+
 2016-02-26  Yao Qi  <yao.qi@linaro.org>
 
 	* gdb.reverse/aarch64.c: [__aarch64__] Include arm_neon.h.