CXX: Fix #1750 (without breaking other unit tests)

[pragmaware]

Rather complicated, but fixes #1750 and does not break existing unit tests.
One can still construct tests that fool the parser. A definitive fix is not feasible without global knowledge
about the program being compiled.

[coveralls]

Coverage decreased (-0.003%) to 84.9% when pulling 9fc990f on pragmaware:fix-bug-1750-attempt-2 into 7e087c5 on universal-ctags:master.

[masatake]

Could you the two commits into one?
git rebase -i master may help you.

Could you rename the .b test case to .d? "make units" says at the end of output:

...
#FIXED:                                 3
	parser-cxx.r/template-nested-triangle-brackets
...

[pragmaware]

Done.

[pragmaware]

Do you still need to review this or we can merge?

[masatake]

I'm sorry to be late. I have had a troulbe in my health.

I have two requests you to change the commits.

1. Could you remove the lines only whitespaces?
   git diff may tell where the lines are.

2. Could you add a ".b" test case that ctags cannot handle well even with your new code?

ctags can handle your example well:

template<char i, bool B = i < 10> void f1(void) { }

I would like you to add paranoid but compilable ones because I would like to try my algorithm.

[masatake]

LGTM. Thank you very much.