[SelectOpti] Fix lifetime intrinsic bug

When a select is converted to a branch and load instructions are sinked to the true/false blocks,
lifetime intrinsics (if present) could be made unsound if not moved.

This conservatively moves all lifetime intrinsics in a transformed BB to the end block to ensure
preserved lifetime semantics.

Reviewed By: davidxl

Differential Revision: https://reviews.llvm.org/D133777