[MC,Hexagon] Simplify switchSection. NFC

Author: MaskRay

llvm/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp

@@ -745,11 +745,8 @@ bool HexagonAsmParser::ParseDirectiveSubsection(SMLoc L) {
   // end of the section.  Only legacy hexagon-gcc created assembly code
   // used negative subsections.
   if ((Res < 0) && (Res > -8193))
-    Subsection = HexagonMCExpr::create(
-        MCConstantExpr::create(8192 + Res, getContext()), getContext());
-
-  getStreamer().switchSection(getStreamer().getCurrentSectionOnly(),
-                              Subsection);
+    Res += 8192;
+  getStreamer().switchSection(getStreamer().getCurrentSectionOnly(), Res);
   return false;
 }