[PATCH] Cleanup early-exit from analyzeCall

[Easwaran Raman]

This makes the following changes to the early bailout code:
    1. Do not exit if the cost has exceeded the threshold taking into
    account only the current vector bonus. It is possible that we might end up
    with a larger vector bonus after we see the entire function. Added a test
    case for this.
    
    2. It currently calculates the 10% and 50% vector bonuses after applying
    a single basic-block bonus on the original threshold. I think expressing
    the bonuses in terms of the original threshold makes it less confusing.
    
    3. Set the threshold to 0 instead of 1 when an unreachable instruction
    is seen after the call. Has no practical effect, but keeps it in line
    with the comment before that code.
    
    4. Add a MaxThreshold field to track the maximum possible value
    Threshold can reach. This is useful if more adjustments are made to the
    threshold.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8267

Files:
  lib/Analysis/IPA/InlineCost.cpp
  test/Transforms/Inline/vector-bonus.ll

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