More N4258 changes. This time vector's constructors

llvm-svn: 238990
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: a8ae392718313e64e2d7bc092b00f51476c074b2
5 files changed