Remove some dead code. CLANG_IS_PRODUCTION is now just a build flag and
is not used in any #ifdef.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@168703 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/driver/driver.cpp b/tools/driver/driver.cpp
index 8233247..a2d5414 100644
--- a/tools/driver/driver.cpp
+++ b/tools/driver/driver.cpp
@@ -397,13 +397,8 @@
   DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
   ProcessWarningOptions(Diags, *DiagOpts);
 
-#ifdef CLANG_IS_PRODUCTION
-  const bool IsProduction = true;
-#else
-  const bool IsProduction = false;
-#endif
   Driver TheDriver(Path.str(), llvm::sys::getDefaultTargetTriple(),
-                   "a.out", IsProduction, Diags);
+                   "a.out", Diags);
 
   // Attempt to find the original path used to invoke the driver, to determine
   // the installed path. We do this manually, because we want to support that