Miscellaneous fixes proposed for 3.5.1

[David Majnemer]

Hi, I think the following list of commit revisions should be merged into
3.5.1:

r214385 InstCombine: Correctly propagate NSW/NUW for x-(-A) -> x+A
r215818 InstCombine: Fix a potential bug in 0 - (X sdiv C)  -> (X sdiv -C)
r216261 InstCombine: Don't unconditionally preserve 'nsw' when shrinking
constants
r216273 InstCombine: Don't unconditionally preserve 'nuw' when shrinking
constants
r216911 LICM: Don't crash when an instruction is used by an unreachable BB
r219566 InstCombine: mul to shl shouldn't preserve nsw
r219567 InstCombine, InstSimplify: (%X /s C1) /s C2 isn't always 0 when C1
* C2 overflow
r219568 InstCombine: Don't fold (X <<s log(INT_MIN)) /s INT_MIN to X
r219634 InstCombine: Don't miscompile (x lshr C1) udiv C2
r219639 InstCombine: Fix miscompile in X % -Y -> X % Y transform
r219713 InstCombine: Don't miscompile X % ((Pow2 << A) >>u B)
r220664 InstCombine: Fix a combine assuming that icmp operands were integers
r221069 InstCombine: Don't assume that m_ZExt matches an Instruction
r221187 InstCombine: Remove infinite loop caused by FoldOpIntoPhi
r221318 Analysis: Make isSafeToSpeculativelyExecute fire less for divides
r221513 SCCP: overdefined calls cannot become constant
r222040 InstCombine: Fix infinite loop caused by visitFPTrunc
r222093 ScalarEvolution: HowFarToZero was wrongly using signed division
r222104 ScalarEvolution: Introduce SCEVSDivision and SCEVUDivision
r222126 ScalarEvolution: Construct SCEVDivision's Derived type instead of
itself
r222265 InstCombine: Fix another infinite loop caused by visitFPTrunc

-- 
David Majnemer
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