Fix ADR instruction encoding

Author: kkHAIKE

llvm/lib/Target/AArch64/MCTargetDesc/AArch64MCCodeEmitter.cpp

@@ -218,8 +218,11 @@ AArch64MCCodeEmitter::getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
   const MCOperand &MO = MI.getOperand(OpIdx);
 
   // If the destination is an immediate, we have nothing to do.
-  if (MO.isImm())
-      return MO.getImm() - (MI.getAddress() >> 12);
+  if (MO.isImm()) {
+    if (MI.getOpcode() == AArch64::ADR)
+      return MO.getImm() - MI.getAddress();
+    return MO.getImm() - (MI.getAddress() >> 12);
+  }
   assert(MO.isExpr() && "Unexpected target type!");
   const MCExpr *Expr = MO.getExpr();