Add AVR backend skeleton

This adds part of the target info code, and adds modifications to
the build scripts so that AVR is recognized a supported, experimental
backend.

It does not include any AVR-specific code, just the bare sources required
for a backend to exist.

From D14039.

llvm-svn: 252865

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/AVR/AVRTargetMachine.cpp b/llvm/lib/Target/AVR/AVRTargetMachine.cpp
new file mode 100644
index 00000000000..a91dce8a63f
--- /dev/null
+++ b/llvm/lib/Target/AVR/AVRTargetMachine.cpp
@@ -0,0 +1,4 @@
+
+extern "C" void LLVMInitializeAVRTarget() {
+
+}