Revert r343089 "[AArch64] - Return address signing dwarf support"

This caused the DebugInfo/Sparc/gnu-window-save.ll test to fail.

> Functions that have signed return addresses need additional dwarf support:
> - After signing the LR, and before authenticating it, the LR register is in a
>   state the is unusable by a debugger or unwinder
> - To account for this a new directive, .cfi_negate_ra_state, is added
> - This directive says the signed state of the LR register has now changed,
>   i.e. unsigned -> signed or signed -> unsigned
> - This directive has the same CFA code as the SPARC directive GNU_window_save
>   (0x2d), adding a macro to account for multiply defined codes
> - This patch matches the gcc implementation of this support:
>   https://patchwork.ozlabs.org/patch/800271/
>
> Differential Revision: https://reviews.llvm.org/D50136

llvm-svn: 343103

1 files changed, 1 insertions, 19 deletions

diff --git a/llvm/lib/BinaryFormat/Dwarf.cpp b/llvm/lib/BinaryFormat/Dwarf.cpp
index 46b95275395..5984de73ae6 100644
--- a/llvm/lib/BinaryFormat/Dwarf.cpp
+++ b/llvm/lib/BinaryFormat/Dwarf.cpp
@@ -13,7 +13,6 @@
 
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/ADT/StringSwitch.h"
-#include "llvm/ADT/Triple.h"
 #include "llvm/Support/ErrorHandling.h"
 
 using namespace llvm;
@@ -456,31 +455,14 @@ StringRef llvm::dwarf::RangeListEncodingString(unsigned Encoding) {
   }
 }
 
-StringRef llvm::dwarf::CallFrameString(unsigned Encoding,
-    Triple::ArchType Arch) {
-#define SELECT_AARCH64 (Arch == llvm::Triple::aarch64_be || Arch == llvm::Triple::aarch64)
-#define SELECT_MIPS64 Arch == llvm::Triple::mips64
-#define SELECT_SPARC64 Arch == llvm::Triple::sparcv9
-#define SELECT_X86 (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64)
-#define HANDLE_DW_CFA(ID, NAME)
-#define HANDLE_DW_CFA_PRED(ID, NAME, PRED) \
-  if (ID == Encoding && PRED) \
-    return "DW_CFA_" #NAME;
-#include "llvm/BinaryFormat/Dwarf.def"
-
+StringRef llvm::dwarf::CallFrameString(unsigned Encoding) {
   switch (Encoding) {
   default:
     return StringRef();
-#define HANDLE_DW_CFA_PRED(ID, NAME, PRED)
 #define HANDLE_DW_CFA(ID, NAME)                                                \
   case DW_CFA_##NAME:                                                          \
     return "DW_CFA_" #NAME;
 #include "llvm/BinaryFormat/Dwarf.def"
-
-#undef SELECT_X86
-#undef SELECT_SPARC64
-#undef SELECT_MIPS64
-#undef SELECT_AARCH64
   }
 }