LiveRangeCalc: Rewrite subrange calculation

This changes subrange calculation to calculate subranges sequentially
instead of in parallel. The code is easier to understand that way and
addresses the code review issues raised about LiveOutData being
hard to understand/needing more comments by removing them :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224272 91177308-0d34-0410-b5e6-96231b3b80d8
[Hexagon] Adding misc multiply encodings and tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224273 91177308-0d34-0410-b5e6-96231b3b80d8
Clarify HowFarToZero computation when the step is a positive power of two.  Functionally this should be identical to the existing code except for the case where Step is maximally negative (eg, INT_MIN).  We now punt in that one corner case to make reasoning about the code easier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224274 91177308-0d34-0410-b5e6-96231b3b80d8
Revert of r223763, in spirit.

r223763 was made to work around a temporary issue where a user of the
JIT was passing down a declaration (incorrectly). This shouldn't
occur, so assert rather than silently continue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224277 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "LiveRangeCalc: Rewrite subrange calculation"

Revert until I find out why non-subreg enabled targets break.

This reverts commit 6097277eefb9c5fb35a7f493c783ee1fd1b9d6a7.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224278 91177308-0d34-0410-b5e6-96231b3b80d8
Clean up warning about unused variable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224281 91177308-0d34-0410-b5e6-96231b3b80d8