Enable DeadMachineInstructionElim when Fast-ISel is enabled.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56604 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetOptions.h

@@ -101,6 +101,12 @@ namespace llvm {
   /// DisableJumpTables - This flag indicates jump tables should not be 
   /// generated.
   extern bool DisableJumpTables;
+
+  /// FastISel - This flag enables fast-path instruction selection
+  /// which trades away generated code quality in favor of reducing
+  /// compile time.
+  extern bool EnableFastISel;
+
 } // End llvm namespace
 
 #endif