Fix grpc_init by removing exec_ctx usage before init

include/grpc/support/tls_gcc.h

@@ -40,12 +40,12 @@ struct gpr_gcc_thread_local {
 
 /** Use GPR_TLS_CLASS_DECL to declare tls static variable members of a class.
  *  GPR_TLS_CLASS_DEF needs to be called to define this member. */
-#define GPR_TLS_CLASS_DECL(name)     \
-  static bool name##_inited; \
+#define GPR_TLS_CLASS_DECL(name) \
+  static bool name##_inited;     \
   static __thread struct gpr_gcc_thread_local name
 
 #define GPR_TLS_CLASS_DEF(name) \
-  bool name##_inited = false; \
+  bool name##_inited = false;   \
   __thread struct gpr_gcc_thread_local name = {0, &(name##_inited)}
 
 #define gpr_tls_init(tls)                  \

src/core/lib/iomgr/iomgr.cc

@@ -50,8 +50,11 @@ void grpc_iomgr_init() {
   gpr_mu_init(&g_mu);
   gpr_cv_init(&g_rcv);
   grpc_core::ExecCtx::GlobalInit();
-  grpc_executor_init();
-  grpc_timer_list_init();
+  {
+    grpc_core::ExecCtx _local_exec_ctx;
+    grpc_executor_init();
+    grpc_timer_list_init();
+  }
   g_root_object.next = g_root_object.prev = &g_root_object;
   g_root_object.name = (char*)"root";
   grpc_network_status_init();

src/core/lib/surface/init.cc

@@ -116,7 +116,6 @@ void grpc_init(void) {
   int i;
   gpr_once_init(&g_basic_init, do_basic_init);
 
-  grpc_core::ExecCtx _local_exec_ctx;
   gpr_mu_lock(&g_init_mu);
   if (++g_initializations == 1) {
     gpr_time_init();