[llvm-commits] Please review: Unittests for IntegersSubsetMapping

[Stepan Dyatkovskiy]

Hi all. Please find the patch for review.
Patch contains unittests for IntegersSubsetMapping methods (4 unittests).

You can find some notes below. Also, the unittests itself also helps to 
understand the purpose of these methods.

IntegersSubsetMapping represents SwitchInst cases as mapping of 
integers-subset to BasicBlock:

   IntegersSubset0 => Successor0
   IntegersSubset1 => Successor1
   IntegersSubset2 => Successor2


IntegersSubsetMapping::isOverlapped(RHS) - returns true if RHS mapping 
overlaps this one.
The example of overlapped mappings:
LHS == { [0..5] => SomeSuccessor0 }
RHS == { [4..10] => SomeSuccessor1 }

IntegersSubsetMapping::detachCase(SomeSuccessor) - moves subset 
associated with SomeSuccessor to the separated mapping.

IntegersSubsetMapping::removeCase - removes subset associated with 
SomeSuccessor.

IntegersSubsetMapping::findSuccessor(IntegerValue) - finds the successor 
that associated with subset that contains given value.

Thanks!
-Stepan.
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