[JumpThread] Enhance finding partial redundant loads by continuing scanning single predecessor

Summary: While scanning predecessors to find an available loaded value, if the predecessor has a single predecessor, we can continue scanning through the single predecessor.

Reviewers: mcrosier, rengolin, reames, davidxl, haicheng

Reviewed By: rengolin

Subscribers: zzheng, llvm-commits

Differential Revision: https://reviews.llvm.org/D29200

llvm-svn: 293896