Move some flag-like props from GlobalContext and TargetLowering to ClFlags.

src/IceRNG.cpp

Index: src/IceRNG.cpp
diff --git a/src/IceRNG.cpp b/src/IceRNG.cpp
index 03171ad432f3fab5736971fac8cec3a4720bcb34..43c7f07de7969e3cab78f3c632315eda336b0586 100644
--- a/src/IceRNG.cpp
+++ b/src/IceRNG.cpp
@@ -13,24 +13,12 @@
 
 #include <time.h>
 
-#include "llvm/Support/CommandLine.h"
-
 #include "IceRNG.h"
 
 namespace Ice {
 
 namespace {
-namespace cl = llvm::cl;
-
-// TODO(stichnot): See if we can easily use LLVM's -rng-seed option
-// and implementation.  I expect the implementation is different and
-// therefore the tests would need to be changed.
-cl::opt<unsigned long long>
-    RandomSeed("sz-seed", cl::desc("Seed the random number generator"),
-               cl::init(time(0)));
-
 const unsigned MAX = 2147483647;
-
 } // end of anonymous namespace
 
 // TODO(wala,stichnot): Switch to RNG implementation from LLVM or C++11.
@@ -39,8 +27,8 @@ const unsigned MAX = 2147483647;
 // subsequent run, for reproducing a bug.  Print the seed in a comment
 // in the asm output.  Embed the seed in the binary via metadata that an
 // attacker can't introspect.
-RandomNumberGenerator::RandomNumberGenerator(llvm::StringRef)
-    : State(RandomSeed) {}
+RandomNumberGenerator::RandomNumberGenerator(uint64_t Seed, llvm::StringRef)
+    : State(Seed) {}
 
 uint64_t RandomNumberGenerator::next(uint64_t Max) {
   // Lewis, Goodman, and Miller (1969)