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Change-Id: Ifbb59ea25b74a50e5b97bd2d3b895857464e4b08

Bug: http://b/21534147
Change-Id: I1717594c3a8cfa2e727dc83db323fe05fa4ca106

We won't be able to build the Windows LLVM until we get one in the
platform, but that doesn't build right now anyway.

As a side effect, stop building compiler-rt. We get this for free as
part of the prebuilt LLVM.

When building with LLVM, use the platform LLVM.

Note that having ANDROID_BUILD_TOP set is now a requirement. This can
be set manually, by `lunch`, or will be handled by `checkbuild.sh`,
but must be set.

Change-Id: Ieceace0e7b2091421eabb363f427f935ddd9436a

I haven't cleaned up the scripts on the assumption that they're all
going the way of the dodo anyway.

Change-Id: Iaee6bc69887d7f50cc5c4fc983c90b1607259115

Change-Id: I03eae28483f069ff20adf00b51bb5cf275ccd9a0

The master-ndk branch of AOSP now contains an already checked out and
patched version of the toolchain repository at toolchain/. The process
of using download-toolchain-sources.sh is now obsolete. Update the
docs accordingly and remove the obsolete components.

Change-Id: I8e059010fef07b376a73e355c985e4e8e784223b

Remove the crap, turn it into markdown, and add the build
instructions.

Change-Id: Iac482a7925456fc77fc7cfc7233e5238020db12f