mruby-brightv-port

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Merge branch 'master' of github.com:mruby/mruby

avoid infinite recursion when error was happened in #inspect; fix #2474

Merge pull request #2475 from take-cheeze/full_core_list

Check mrbgem.rake instead of directory to ignore empty directories in full-core gembox.

Check mrbgem.rake instead of directory to ignore empty directories in full-core.

need to call write_barrier on every fiber context switch

git push origin masterMerge branch 'take-cheeze-instance_eval'

remove unused local variables; ref #2473

Implement string compiling `instance_eval` method.

fiber stack allocation size should be bigger than irep->nregs

backtrace supression condition was wrong; fix #2472

Merge pull request #2471 from take-cheeze/const_defined_at_ret

Use `mrb_bool` as return type of `mrb_const_defined_at`.

Merge pull request #2464 from take-cheeze/inherit_verbose_flag

Inherit `$mrbtest_verbose` flag in core tests.

Set `$mrbtest_verbose` flag in `mrb_init_test_driver`.

Use `mrb_bool` as return type of `mrb_const_defined_at`.

Merge pull request #2465 from cubicdaiya/feature/comment_style

use C style comments instead of C++ style comments

use C style comments instead of C++ style comments

Merge pull request #2463 from take-cheeze/fix_rake

Fix rake failure since `mrbtest_objs` isn't flattened.

Merge branch 'master' of github.com:mruby/mruby

rescue SystemStackError that comes from inspecting self-referencing Hashes and Arrays; fix #2461

avoid print backtrace for SystemStackError

Fix rake failure since `mrbtest_objs` isn't flattened.
Append generated test object to `@test_objs` of mrbgem spec.
Add method `custom_test_init?` to check whether mrbgem has custom test init function.

use SystemStackError instead of RuntimeError

Run mrbgem and core tests on minimum dependencies.
Solves #2355.

In test drivers:
* Uses `mrb_t_pass_result` to check and pass test result to main `mrb_state`.
* Adds `mrb_init_test_driver` to init test `mrb_state`.

check the return value of `fwrite`

remove spaces after open parens

initialize `args` in `parse_args`

coding style adjustments

update expected error message in bintest

rewrite stripping

Previous version ignored some errors, and didn't free memory and close files.
Now no memory will be dynamically allocated to simplify error handling.

This commit also fixes a wrong check:

files[i] = fopen(argv[i], "wb");
if (!ireps[i]) {

Improve error messages a bit and add missing newline to one.

check `mrb_open` return value