Look through the g1ConcurrentMark files and fix obvious coding style issues like:

 - camelCase variable and method naming
 - missing brackets around one-line if-statement bodies.
 - method naming (getters/setters)
 - use _g1h member variable instead of _g1 or another method local variable
 - use assert_at_safepoint* macros
 - remove incomprehensible comments

and other stuff.