Hexagon: Expand br_cc.
Hexagon: Expand br_cc.

It fixes following tests for Hexagon:

CodeGen/Generic/2003-07-29-BadConstSbyte.ll
CodeGen/Generic/2005-10-21-longlonggtu.ll
CodeGen/Generic/2009-04-28-i128-cmp-crash.ll
CodeGen/Generic/MachineBranchProb.ll
CodeGen/Generic/builtin-expect.ll
CodeGen/Generic/pr12507.ll



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@178794 91177308-0d34-0410-b5e6-96231b3b80d8

chubbymaggie/asap,dslab-epfl/asap,dslab-epfl/asap,chubbymaggie/asap,llvm-mirror/llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,llvm-mirror/llvm,apple/swift-llvm,chubbymaggie/asap,dslab-epfl/asap,apple/swift-llvm,chubbymaggie/asap,llvm-mirror/llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,chubbymaggie/asap,chubbymaggie/asap,dslab-epfl/asap,llvm-mirror/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,dslab-epfl/asap,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm