[NFC] Rename DwarfAccelTable and move header.

This patch renames DwarfAccelTable.{h,cpp} to AccelTable.{h,cpp} and
moves the header to the include dir so it is accessible by the
dsymutil implementation.

Differential revision: https://reviews.llvm.org/D42529

llvm-svn: 323654
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 874faeb..fa9b8ed 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -18,7 +18,6 @@
 #include "DbgValueHistoryCalculator.h"
 #include "DebugHandlerBase.h"
 #include "DebugLocStream.h"
-#include "DwarfAccelTable.h"
 #include "DwarfFile.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
@@ -31,6 +30,7 @@
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/CodeGen/AccelTable.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/IR/DebugInfoMetadata.h"
 #include "llvm/IR/DebugLoc.h"