[GlobalISel] Use the same name for all remarks.
[GlobalISel] Use the same name for all remarks.

While there, switch to the explicit ctor.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@296059 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 8959f2e32fd67b561f007c4a0ef481108c54b152)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm