Allow using getters for metadata fields of BBAddrMap::BBEntry.

[rahmanl]

Summary

This is a prequel for D148360.

[jhenderson]

LGTM, but no point in landing this until the subsequent patch is ready.

llvm/include/llvm/Object/ELFTypes.h

BBEntry(uint32_t ID, uint32_t Offset, uint32_t Size, uint32_t Metadata)
           HasTailCall(Metadata & (1 << 1)), IsEHPad(Metadata & (1 << 2)),
           CanFallThrough(Metadata & (1 << 3)){};
 
     bool operator==(const BBEntry &Other) const {
       return ID == Other.ID && Offset == Other.Offset && Size == Other.Size &&
              HasReturn == Other.HasReturn && HasTailCall == Other.HasTailCall &&
              IsEHPad == Other.IsEHPad && CanFallThrough == Other.CanFallThrough;
     }
+
+    bool hasReturn() const { return HasReturn; }
+    bool hasTailCall() const { return HasTailCall; }
+    bool isEHPad() const { return IsEHPad; }
+    bool canFallThrough() const { return CanFallThrough; }
   };
   std::vector<BBEntry> BBEntries; // Basic block entries for this function.
 
   // Equality operator for unit testing.
   bool operator==(const BBAddrMap &Other) const {
     return Addr == Other.Addr && std::equal(BBEntries.begin(), BBEntries.end(),
                                             Other.BBEntries.begin());
   }
 };
 
 } // end namespace object.
 } // end namespace llvm.
 
 #endif // LLVM_OBJECT_ELFTYPES_H

llvm/tools/llvm-readobj/ELFDumper.cpp

for (const BBAddrMap &AM : *BBAddrMapOrErr) {
       W.printString("Name", FuncName);
 
       ListScope L(W, "BB entries");
       for (const BBAddrMap::BBEntry &BBE : AM.BBEntries) {
         DictScope L(W);
         W.printNumber("ID", BBE.ID);
         W.printHex("Offset", BBE.Offset);
         W.printHex("Size", BBE.Size);
-        W.printBoolean("HasReturn", BBE.HasReturn);
-        W.printBoolean("HasTailCall", BBE.HasTailCall);
-        W.printBoolean("IsEHPad", BBE.IsEHPad);
-        W.printBoolean("CanFallThrough", BBE.CanFallThrough);
+        W.printBoolean("HasReturn", BBE.hasReturn());
+        W.printBoolean("HasTailCall", BBE.hasTailCall());
+        W.printBoolean("IsEHPad", BBE.isEHPad());
+        W.printBoolean("CanFallThrough", BBE.canFallThrough());
       }
     }
   }
 }
 
 template <class ELFT> void LLVMELFDumper<ELFT>::printAddrsig() {
   ListScope L(W, "Addrsig");
   if (!this->DotAddrsigSec)