vm_core.h: export symbols of shared variables

vm_insnhelper.h: ditto.

All changes are for reducing changes required to introduce JIT compiler.
Unlike functions that can be inlined by header, those variables should
be shared with JIT-ed code. This will help reducing cost of rebase
against upstream.

[close GH-1720]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60231 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_core.h

@@ -1570,10 +1570,15 @@ VALUE rb_catch_protect(VALUE t, rb_block_call_func *func, VALUE data, enum ruby_
 /* for thread */
 
 #if RUBY_VM_THREAD_MODEL == 2
+
+RUBY_SYMBOL_EXPORT_BEGIN
+
 extern rb_thread_t *ruby_current_thread;
 extern rb_vm_t *ruby_current_vm;
 extern rb_event_flag_t ruby_vm_event_flags;
 
+RUBY_SYMBOL_EXPORT_END
+
 #define GET_VM() ruby_current_vm
 #define GET_THREAD() ruby_current_thread
 

vm_insnhelper.h

@@ -12,8 +12,12 @@
 #ifndef RUBY_INSNHELPER_H
 #define RUBY_INSNHELPER_H
 
+RUBY_SYMBOL_EXPORT_BEGIN
+
 extern VALUE ruby_vm_const_missing_count;
 
+RUBY_SYMBOL_EXPORT_END
+
 #if VM_COLLECT_USAGE_DETAILS
 #define COLLECT_USAGE_INSN(insn)           vm_collect_usage_insn(insn)
 #define COLLECT_USAGE_OPERAND(insn, n, op) vm_collect_usage_operand((insn), (n), ((VALUE)(op)))