target/tilegx: Use env_cpu

Cleanup in the boilerplate that each target must define.
Replace tilegx_env_get_cpu with env_archcpu.  The combination
CPU(tilegx_env_get_cpu) should have used ENV_GET_CPU to begin;
use env_cpu now.
Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

linux-user/tilegx/cpu_loop.c

@@ -206,7 +206,7 @@ static void do_fetch(CPUTLGState *env, int trapnr, bool quad)
 
 void cpu_loop(CPUTLGState *env)
 {
-    CPUState *cs = CPU(tilegx_env_get_cpu(env));
+    CPUState *cs = env_cpu(env);
     int trapnr;
 
     while (1) {

target/tilegx/cpu.h

@@ -138,11 +138,6 @@ typedef struct TileGXCPU {
     CPUTLGState env;
 } TileGXCPU;
 
-static inline TileGXCPU *tilegx_env_get_cpu(CPUTLGState *env)
-{
-    return container_of(env, TileGXCPU, env);
-}
-
 #define ENV_OFFSET offsetof(TileGXCPU, env)
 
 /* TILE-Gx memory attributes */

target/tilegx/helper.c

@@ -28,7 +28,7 @@
 
 void helper_exception(CPUTLGState *env, uint32_t excp)
 {
-    CPUState *cs = CPU(tilegx_env_get_cpu(env));
+    CPUState *cs = env_cpu(env);
 
     cs->exception_index = excp;
     cpu_loop_exit(cs);