[racket-dev] Racket fails to build with backtrace

I've noticed several problems in `newgc.c` which prevent Racket from
building with backtrace support and I'm sending you two trivial patches
which will hopefully help fix these issues properly.

I think these commits:

http://git.racket-lang.org/plt/commitdiff/9b6ccb1476938785e95474968429359f05d7aaba
http://git.racket-lang.org/plt/commitdiff/706c1b9e00b1534a32f1c5df8ca35b16ec450e89

renamed `GC` to `GC_instance`, but there're some leftovers in
`backtrace.c` and `newgc.c` which lead to build failure due to
undeclared `GC` identifier.

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Commit
http://git.racket-lang.org/plt/commit/baab09fc1b3cb37b31c13920db230b28e7bde4f0
introduced arity change in `GC_X_variable_stack` but one of the calls in
`newgc.c` was not updated to match new function signature.

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-- 
Happy Hacking.

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