[Fuchsia] Set ENABLE_X86_RELAX_RELOCATIONS for Fuchsia builds
[Fuchsia] Set ENABLE_X86_RELAX_RELOCATIONS for Fuchsia builds

This is a "Does your linker support it?" option, and all ours do.

Patch by Roland McGrath

Differential Revision: https://reviews.llvm.org/D37785

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@313173 91177308-0d34-0410-b5e6-96231b3b80d8

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