[LLVM][IR][NFC] Simplify writeDIGenericSubrange

[gAlfonso-bit]

Summary

The expression at the end is needlessly complex so I have simplified it.

[gAlfonso-bit]

Added context to patch

llvm/lib/IR/AsmWriter.cpp

 
   auto IsConstant = [&](Metadata *Bound) -> bool {
     if (auto *BE = dyn_cast_or_null<DIExpression>(Bound)) {
-      return BE->isConstant()
-                 ? DIExpression::SignedOrUnsignedConstant::SignedConstant ==
-                       *BE->isConstant()
-                 : false;
+      return BE->isConstant() &&
+             DIExpression::SignedOrUnsignedConstant::SignedConstant ==
+                 *BE->isConstant();
     }
     return false;
   };