[llvm-commits] [patch] BranchFolding debug infomation

[Andrew Stanford-Jason]

This patch adds better retention of DebugLoc information during 
BranchFolding.

Where the BranchFolding pass removes a branch then adds another better 
branch, the DebugLoc information can be maintained throughout by 
grabbing the DebugLoc before the RemoveBranch and then passing the 
result to the InsertBranch.
There is one new function:
   static DebugLoc getBranchDL(MachineBasicBlock &MBB);
It is intended to extract the DebugLoc information from the latest 
branching instruction in MBB. If there is no branching instructions then 
returning a default DebugLoc is not a regression.

With this change it should be possible to maintain higher quality debug 
information.

Andrew
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