Add option ShortStatementLines to trigger this check only if the statement spans
over at least a given number of lines.
Modifications from the original patch:
merged test/clang-tidy/misc-braces-around-statements-always.cpp into
test/clang-tidy/misc-braces-around-statements.cpp and removed unnecessary
CHECK-NOTs from the tests.
http://reviews.llvm.org/D5642
Patch by Marek Kurdej!
llvm-svn: 219611