[xcore] Only support the 'm' inline assembly memory constraint. NFC.
[xcore] Only support the 'm' inline assembly memory constraint. NFC.

Summary:
XCore doesn't seem to have any additional constraints. Therefore remove
the target hook.

No functional change intended.

Reviewers: friedgold

Reviewed By: friedgold

Subscribers: friedgold, llvm-commits

Differential Revision: http://reviews.llvm.org/D8921


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@237442 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,dslab-epfl/asap,dslab-epfl/asap,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,dslab-epfl/asap,dslab-epfl/asap,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,apple/swift-llvm,dslab-epfl/asap,apple/swift-llvm,apple/swift-llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,dslab-epfl/asap,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm