fix compiler error.

Author: nkcsgexi

lib/Sema/TypeCheckSwitchStmt.cpp

@@ -910,9 +910,9 @@ namespace {
           TC.Context.Diags.diagnose(StartLoc, diag::empty_switch_stmt)
              .fixItInsert(EndLoc, Buffer.str());
         } else {
-          Ctx.Diags.diagnose(StartLoc, diag::non_exhaustive_switch);
-          Ctx.Diags.diagnose(StartLoc, diag::missing_several_cases,
-                             uncovered.isEmpty()).fixItInsert(EndLoc,
+          TC.Context.Diags.diagnose(StartLoc, diag::non_exhaustive_switch);
+          TC.Context.Diags.diagnose(StartLoc, diag::missing_several_cases,
+                                    uncovered.isEmpty()).fixItInsert(EndLoc,
                                                               Buffer.str());
         }
         return;
@@ -945,11 +945,11 @@ namespace {
           }
         }
 
-        Ctx.Diags.diagnose(StartLoc, diag::non_exhaustive_switch);
-        Ctx.Diags.diagnose(StartLoc, diag::missing_several_cases, false)
+        TC.Context.Diags.diagnose(StartLoc, diag::non_exhaustive_switch);
+        TC.Context.Diags.diagnose(StartLoc, diag::missing_several_cases, false)
           .fixItInsert(EndLoc, Buffer.str());
       } else {
-        Ctx.Diags.diagnose(StartLoc, diag::non_exhaustive_switch);
+        TC.Context.Diags.diagnose(StartLoc, diag::non_exhaustive_switch);
 
         for (auto &uncoveredSpace : uncovered.getSpaces()) {
           SmallVector<Space, 4> flats;