[Target] Add NoSignedZerosFPMath to the TargetOptions constructor
[Target] Add NoSignedZerosFPMath to the TargetOptions constructor

Most flags were already initialized by the TargetOptions constructor but
we missed out on one.  Also, simplify the constructor by using field
initializers when possible.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@293406 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm