Revert "[BTF] Add BTF DebugInfo"

This reverts commit 9c6b970db8bc63b28ce58a129bb1580a6a3c6caf.

llvm-svn: 348004
diff --git a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
index 7dcd561..cdf8dc7 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
@@ -8,7 +8,7 @@
 //===----------------------------------------------------------------------===//
 //
 // Common functionality for different debug information format backends.
-// LLVM currently supports DWARF, CodeView and BTF.
+// LLVM currently supports DWARF and CodeView.
 //
 //===----------------------------------------------------------------------===//