[mandatory-inlining] Improve readability by using standard loop variable names for instructions, basic blocks.
[mandatory-inlining] Improve readability by using standard loop variable names for instructions, basic blocks.

F{I,E} is generally used for function iterators over a module's functions.
B{I,E} are generally standard for block iterator, block end. I make the II
change just to make it clearer that the given value is an instruction iterator
like in other parts of the SIL Optimizer.

rdar://31521023

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