[scan-build] fix dead store warnings emitted on clang code base

[apelete]

Summary

This fixes dead store warnings of the type "dead assignment" reported
by CLang Static Analyzer on the following files:

• lib/Lex/Lexer.cpp,
• lib/Lex/ModuleMap.cpp.

Signed-off-by: Apelete Seketeli <[e-mail]>

lib/Lex/Lexer.cpp

if (TheTok.isAtStartOfLine() && TheTok.getKind() == tok::hash) {
           break;
         }
       }
       
       // We only end up here if we didn't recognize the preprocessor
       // directive or it was one that can't occur in the preamble at this
       // point. Roll back the current token to the location of the '#'.
       InPreprocessorDirective = false;
+      (void) InPreprocessorDirective;
       TheTok = HashTok;
     }
 
     // We hit a token that we don't recognize as being in the
     // "preprocessing only" part of the file, so we're no longer in
     // the preamble.
     break;
   } while (true);

lib/Lex/ModuleMap.cpp

if (!Failed && ActiveModule->InferSubmodules) {
                      diag::note_mmap_prev_definition);
       Failed = true;
     }
 
     // Check for the 'framework' keyword, which is not permitted here.
     if (Framework) {
       Diags.Report(StarLoc, diag::err_mmap_inferred_framework_submodule);
       Framework = false;
+      (void) Framework;
     }
   } else if (Explicit) {
     Diags.Report(StarLoc, diag::err_mmap_explicit_inferred_framework);
     Explicit = false;
   }
 
   // If there were any problems with this inferred submodule, skip its body.
   if (Failed) {