[CMake][Fuchsia] Enable build ID, relaxations for first stage
[CMake][Fuchsia] Enable build ID, relaxations for first stage

We want these to be used for the second stage compiler as well.

Differential Revision: https://reviews.llvm.org/D56359

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@350486 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang