[libclang] Have clang_getCursorSpelling() return the string for a CXCursor_IntegerLiteral cursor

[GrislyMe]

Summary

Return the IntegerLiteral cursor value in a string.
The value will be represented in base-10 and unsigned.

clang/tools/libclang/CIndex.cpp

if (C.kind == CXCursor_ObjCStringLiteral ||
       } else {
         SLit = cast<StringLiteral>(E);
       }
       SmallString<256> Buf;
       llvm::raw_svector_ostream OS(Buf);
       SLit->outputString(OS);
       return cxstring::createDup(OS.str());
     }
+    if (C.kind == CXCursor_IntegerLiteral) {
+      SmallString<64> Buf;
+      if (const IntegerLiteral *ILit = dyn_cast<IntegerLiteral>(E)) {
+        ILit->getValue().toString(Buf, 10, true);
+        return cxstring::createDup(Buf);
+      }
+    }
 
     const Decl *D = getDeclFromExpr(getCursorExpr(C));
     if (D)
       return getDeclSpelling(D);
     return cxstring::createEmpty();
   }
 
   if (clang_isStatement(C.kind)) {