Changes

[BranchProbabilityInfo] Remove block handles in eraseBlock()

BranchProbabilityInfo::eraseBlock() is a public method and
can be called without deleting the block itself.
This method is made remove the correspondent tracking handle
from BranchProbabilityInfo::Handles along with
the probabilities of the block. Handles.erase() call is moved
to eraseBlock().
In setEdgeProbability() we need to add the block handle only once.

Reviewed By: kazu

Differential Revision: https://reviews.llvm.org/D90838

[Test] Run test with expensive SE inference. NFC

The planned changes require expensive inference to kick in

[BranchProbabilityInfo] Introduce method copyEdgeProbabilities(). NFC

A new method is introduced to allow bulk copy of outgoing edge
probabilities from one block to another. This can be useful when
a block is cloned from another one and we do not know if there
are edge probabilities set for the original block or not.
Copying outside of the BranchProbabilityInfo class makes the user
unconditionally set the cloned block's edge probabilities even if
they are unset for the original block.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D90839

[Test] One more test on IndVars with negative step

[X86] use macros to split GFNI intrinsics into different kinds

Tremont microarchitecture only has GFNI(SSE) version, not AVX and
AVX512 version. This patch is to avoid compiling fail on Windows when
using -march=tremont to invoke one of GFNI(SSE) intrinsic.

Differential Revision: https://reviews.llvm.org/D90822