Add Xtensa MCTargetDesc stub. Add XtensaTargetMachine and XtensaTargetInfo.
Modify llib/Target/LLVMBuild.txt. Now Xtensa target could be builded as EXPERIMENTAL.
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Quickly scanning this patch shows that it still uses the previous license. I think these need to be updated to the new Apache 2.0 license, see any file for the up-to-date file header.
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Patch is updated according to LLVM upstream version and latest Xtensa backend version.