[llvm-commits] [commit-after-approval] printf("foo %s baz\n", "bar") -> puts("foo bar baz")

[Ryan Flynn]

given a printf() call format containing a single "%s" conversion
specifier and a constant string parameter, inlines parameter into
format and lowers printf() to puts().

it's a bit more complex than the other printf() optimizations, but i
happened to run into the situation and it seemed pretty common and
straightforward to implement.

my first attempt at an optimization, constructive criticism appreciated.
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