[FastISel][AArch64] Fold mul into add/sub and logical operations.

Try to fold the multiply into the add/sub or logical operations (when
possible).

This is related to rdar://problem/18369687.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217978 91177308-0d34-0410-b5e6-96231b3b80d8
Exclude known and bugzilled failures from UBSan bootstrap

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217979 91177308-0d34-0410-b5e6-96231b3b80d8
[FastISel][AArch64] Simplify mul to shift when possible.

This is related to rdar://problem/18369687.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217980 91177308-0d34-0410-b5e6-96231b3b80d8
Internalize common symbols when we can.

This fixes pr20974.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217981 91177308-0d34-0410-b5e6-96231b3b80d8