Add cl::ZeroOrMore to get around build system issues

[hiraditya]

Summary

It is quite common to get multiple instances of optimization flags while building. The following optimizations doesn't have cl::ZeroOrMore which causes errors during the build.

[alexbdv]

Thanks for fixing this !

[mehdi_amini]

This comment was removed by mehdi_amini.

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

 static cl::opt<bool>
     EnablePrepareForThinLTO("prepare-for-thinlto", cl::init(false), cl::Hidden,
                             cl::desc("Enable preparation for ThinLTO."));
 
 static cl::opt<bool>
     EnablePerformThinLTO("perform-thinlto", cl::init(false), cl::Hidden,
                          cl::desc("Enable performing ThinLTO."));
 
-cl::opt<bool> EnableHotColdSplit("hot-cold-split", cl::init(false), cl::Hidden,
-    cl::desc("Enable hot-cold splitting pass"));
+cl::opt<bool> EnableHotColdSplit("hot-cold-split", cl::init(false),
+    cl::ZeroOrMore, cl::desc("Enable hot-cold splitting pass"));
 
 static cl::opt<bool> UseLoopVersioningLICM(
     "enable-loop-versioning-licm", cl::init(false), cl::Hidden,
     cl::desc("Enable the experimental Loop Versioning LICM pass"));
 
 static cl::opt<bool>
     DisablePreInliner("disable-preinline", cl::init(false), cl::Hidden,
                       cl::desc("Disable pre-instrumentation inliner"));
 
 static cl::opt<int> PreInlineThreshold(
     "preinline-threshold", cl::Hidden, cl::init(75), cl::ZeroOrMore,
     cl::desc("Control the amount of inlining in pre-instrumentation inliner "
              "(default = 75)"));
 
 static cl::opt<bool> EnableGVNHoist(
-    "enable-gvn-hoist", cl::init(false), cl::Hidden,
+    "enable-gvn-hoist", cl::init(false), cl::ZeroOrMore,
     cl::desc("Enable the GVN hoisting pass (default = off)"));
 
 static cl::opt<bool>
     DisableLibCallsShrinkWrap("disable-libcalls-shrinkwrap", cl::init(false),
                               cl::Hidden,
                               cl::desc("Disable shrink-wrap library calls"));
 
 static cl::opt<bool> EnableSimpleLoopUnswitch(
     "enable-simple-loop-unswitch", cl::init(false), cl::Hidden,
     cl::desc("Enable the simple loop unswitch pass. Also enables independent "
              "cleanup passes integrated into the loop pass manager pipeline."));
 
 static cl::opt<bool> EnableGVNSink(
-    "enable-gvn-sink", cl::init(false), cl::Hidden,
+    "enable-gvn-sink", cl::init(false), cl::ZeroOrMore,
     cl::desc("Enable the GVN sinking pass (default = off)"));
 
 // This option is used in simplifying testing SampleFDO optimizations for
 // profile loading.
 static cl::opt<bool>
     EnableCHR("enable-chr", cl::init(true), cl::Hidden,
               cl::desc("Enable control height reduction optimization (CHR)"));