Remove unused MCObjectFileInfo::SupportsWeakOmittedEHFrame

The code is related to pre-AsmPrinter legacy code (see
9cb0e94 in 2008). The only caller has
been removed by bb237c7 in 2011.

Author: MaskRay

llvm/include/llvm/MC/MCObjectFileInfo.h

@@ -29,10 +29,6 @@ class MCSection;
 
 class LLVM_ABI MCObjectFileInfo {
 protected:
-  /// True if target object file supports a weak_definition of constant 0 for an
-  /// omitted EH frame.
-  bool SupportsWeakOmittedEHFrame = false;
-
   /// True if the target object file supports emitting a compact unwind section
   /// without an associated EH frame section.
   bool SupportsCompactUnwindWithoutEHFrame = false;
@@ -260,9 +256,6 @@ class LLVM_ABI MCObjectFileInfo {
   virtual ~MCObjectFileInfo();
   MCContext &getContext() const { return *Ctx; }
 
-  bool getSupportsWeakOmittedEHFrame() const {
-    return SupportsWeakOmittedEHFrame;
-  }
   bool getSupportsCompactUnwindWithoutEHFrame() const {
     return SupportsCompactUnwindWithoutEHFrame;
   }

llvm/lib/MC/MCObjectFileInfo.cpp

@@ -61,9 +61,6 @@ static bool useCompactUnwind(const Triple &T) {
 }
 
 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
-  // MachO
-  SupportsWeakOmittedEHFrame = false;
-
   EHFrameSection = Ctx->getMachOSection(
       "__TEXT", "__eh_frame",
       MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
@@ -1090,7 +1087,6 @@ void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC,
   Ctx = &MCCtx;
 
   // Common.
-  SupportsWeakOmittedEHFrame = true;
   SupportsCompactUnwindWithoutEHFrame = false;
   OmitDwarfIfHaveCompactUnwind = false;