[X86] Use APInt instead of SmallBitVector for tracking Zeroable elements in shuffle...

[X86] Use APInt instead of SmallBitVector for tracking Zeroable elements in shuffle lowering

Summary:
SmallBitVector uses a malloc for more than 58 bits on a 64-bit target and more than 27 bits on a 32-bit target. Some of the vector types we deal with here use more than those number of elements and therefore cause a malloc.

APInt on the other hand supports up to 64 bits without a malloc. That's the maximum number of bits we need here so we can avoid a malloc for all cases by using APInt.

Reviewers: RKSimon

Reviewed By: RKSimon

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D30390

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296354 91177308-0d34-0410-b5e6-96231b3b80d8