Set hasSideEffects=0 for PHI and fix affected passes

Set hasSideEffects=0 for PHI and fix affected passes

Previously, hasSideEffects was ? for TargetOpcode::PHI and would be inferred
as 1. D37065 sets the previously inferred properties explicitly. This patch sets
hasSideEffects=0 for PHI, as it is for G_PHI. MachineInstr::isSafeToMove has
been updated so it still returns false for PHI.

Additionally, HexagonBitSimplify relied on a PHI node having the
hasUnmodeledSideEffects property. This patch fixes that assumption.

Differential Revision: https://reviews.llvm.org/D37097

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317721 91177308-0d34-0410-b5e6-96231b3b80d8