Move aarch64-insn.o to arch/aarch64-insn.o and Remove a rule for arch/*.c

This patch moves aarch64-insn.o to arch/aarch64-insn.o.  Then, all
arch/*.c are built to arch/*.o, so we don't need a Makefile rule to build
*.o from arch/*.c.  This patch removes it too.

gdb:

2017-10-06  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (ALL_64_TARGET_OBS): Replace aarch64-insn.o with
	arch/aarch64-insn.o.
	Remove one rule.
	* configure.tgt: Replace aarch64-insn.o with arch/aarch64-insn.o.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2017-10-06  Yao Qi  <yao.qi@linaro.org>
+
+	* Makefile.in (ALL_64_TARGET_OBS): Replace aarch64-insn.o with
+	arch/aarch64-insn.o.
+	Remove one rule.
+	* configure.tgt: Replace aarch64-insn.o with arch/aarch64-insn.o.
+
 2017-10-06  Yao Qi  <yao.qi@linaro.org>
 
 	* Makefile.in (ALL_TARGET_OBS): Replace arm.o, arm-get-next-pcs.o,

gdb/Makefile.in

@@ -759,7 +759,6 @@ TARGET_OBS = @TARGET_OBS@
 # (used with --enable-targets=all --enable-64-bit-bfd).
 ALL_64_TARGET_OBS = \
 	aarch64-fbsd-tdep.o \
-	aarch64-insn.o \
 	aarch64-linux-tdep.o \
 	aarch64-newlib-tdep.o \
 	aarch64-tdep.o \
@@ -778,6 +777,7 @@ ALL_64_TARGET_OBS = \
 	amd64-sol2-tdep.o \
 	amd64-tdep.o \
 	amd64-windows-tdep.o \
+	arch/aarch64-insn.o \
 	arch/amd64.o \
 	ia64-linux-tdep.o \
 	ia64-tdep.o \
@@ -1926,10 +1926,6 @@ all: gdb$(EXEEXT) $(CONFIG_ALL)
 	$(POSTCOMPILE)
 
 # Rules for compiling .c files in the various source subdirectories.
-%.o: ${srcdir}/arch/%.c
-	$(COMPILE) $<
-	$(POSTCOMPILE)
-
 %.o: $(srcdir)/cli/%.c
 	$(COMPILE) $<
 	$(POSTCOMPILE)

gdb/configure.tgt

@@ -46,7 +46,7 @@ amd64_tobjs="amd64-tdep.o arch/amd64.o"
 
 case "${targ}" in
 aarch64*-*-*)
-	cpu_obs="aarch64-tdep.o aarch64-insn.o";;
+	cpu_obs="aarch64-tdep.o arch/aarch64-insn.o";;
 
 alpha*-*-*)
 	# Target: Alpha