Introduction of improved switch lowering.

src/IceClFlags.cpp

Index: src/IceClFlags.cpp
diff --git a/src/IceClFlags.cpp b/src/IceClFlags.cpp
index 2d2e641eb50133ee090eae36264e01a38a382c2f..746cb3e4adc51d7fbd63383577f5c8fc79a89b0d 100644
--- a/src/IceClFlags.cpp
+++ b/src/IceClFlags.cpp
@@ -176,6 +176,10 @@ cl::opt<std::string>
     TranslateOnly("translate-only",
                   cl::desc("Translate only the given function"), cl::init(""));
 
+cl::opt<bool>
+    UseAdvancedSwitchLowering("adv-switch",
+                              cl::desc("Use advanced switch lowering"));
+
 cl::opt<bool> UseSandboxing("sandbox", cl::desc("Use sandboxing"));
 
 cl::opt<std::string> VerboseFocusOn(
@@ -341,6 +345,7 @@ void ClFlags::resetClFlags(ClFlags &OutFlags) {
   OutFlags.SkipUnimplemented = false;
   OutFlags.SubzeroTimingEnabled = false;
   OutFlags.TimeEachFunction = false;
+  OutFlags.UseAdvancedSwitchLowering = false;
   OutFlags.UseSandboxing = false;
   // Enum and integer fields.
   OutFlags.Opt = Opt_m1;
@@ -410,6 +415,7 @@ void ClFlags::getParsedClFlags(ClFlags &OutFlags) {
   OutFlags.setTimeEachFunction(::TimeEachFunction);
   OutFlags.setTimingFocusOn(::TimingFocusOn);
   OutFlags.setTranslateOnly(::TranslateOnly);
+  OutFlags.setUseAdvancedSwitchLowering(::UseAdvancedSwitchLowering);
   OutFlags.setUseSandboxing(::UseSandboxing);
   OutFlags.setVerboseFocusOn(::VerboseFocusOn);
   OutFlags.setOutFileType(::OutFileType);