[PATCH] Document NO_PROFILE_COUNTERS more accurately

[Jie Zhang]

NO_PROFILE_COUNTERS is used as a C expression in GCC. It's needed to be 
defined as an expression with nonzero value if the mcount does not need 
a counter variable. So saying "Define this macro if ..." in document is 
not enough. This patch fixes this.

Is it OK?

Thanks,
Jie
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