MC: Remove unused MCFixupKindInfo::FKF_Constant

This was an ARM workaround, which has been removed by llvm#76574

Author: MaskRay

llvm/include/llvm/MC/MCFixupKindInfo.h

@@ -25,11 +25,6 @@ struct MCFixupKindInfo {
 
     /// Should this fixup be evaluated in a target dependent manner?
     FKF_IsTarget = (1 << 2),
-
-    /// This fixup kind should be resolved if defined.
-    /// FIXME This is a workaround because we don't support certain ARM
-    /// relocation types. This flag should eventually be removed.
-    FKF_Constant = 1 << 3,
   };
 
   /// A target specific name for the fixup kind. The names will be unique for

llvm/lib/MC/MCAssembler.cpp

@@ -184,9 +184,8 @@ bool MCAssembler::evaluateFixup(const MCFixup &Fixup, const MCFragment *DF,
       Value -= Offset;
 
       if (Add && !Sub && !Add->isUndefined() && !Add->isAbsolute()) {
-        IsResolved = (FixupFlags & MCFixupKindInfo::FKF_Constant) ||
-                     getWriter().isSymbolRefDifferenceFullyResolvedImpl(
-                         *this, *Add, *DF, false, true);
+        IsResolved = getWriter().isSymbolRefDifferenceFullyResolvedImpl(
+            *this, *Add, *DF, false, true);
       }
     } else {
       IsResolved = Target.isAbsolute();