Add constant blinding/pooling option for X8632 code translation

src/IceGlobalContext.cpp

Index: src/IceGlobalContext.cpp
diff --git a/src/IceGlobalContext.cpp b/src/IceGlobalContext.cpp
index 1c468ecf97a93ebaf5f85ba7a681579558dc5b63..7010fb6de7e24a9061a658503848b0c385b278e4 100644
--- a/src/IceGlobalContext.cpp
+++ b/src/IceGlobalContext.cpp
@@ -225,7 +225,8 @@ GlobalContext::GlobalContext(Ostream *OsDump, Ostream *OsEmit, Ostream *OsError,
       EmitQ(/*Sequential=*/Flags.isSequential()),
       DataLowering(TargetDataLowering::createLowering(this)),
       HasSeenCode(false),
-      ProfileBlockInfoVarDecl(VariableDeclaration::create()) {
+      ProfileBlockInfoVarDecl(VariableDeclaration::create()),
+      RandomizationCookie(0) {
   assert(OsDump && "OsDump is not defined for GlobalContext");
   assert(OsEmit && "OsEmit is not defined for GlobalContext");
   assert(OsError && "OsError is not defined for GlobalContext");
@@ -265,6 +266,10 @@ GlobalContext::GlobalContext(Ostream *OsDump, Ostream *OsEmit, Ostream *OsError,
   ProfileBlockInfoVarDecl->setName("__Sz_block_profile_info");
   ProfileBlockInfoVarDecl->setSuppressMangling();
   ProfileBlockInfoVarDecl->setLinkage(llvm::GlobalValue::ExternalLinkage);
+
+  // Initialize the randomization cookie for diversification.

[Jim Stichnoth, 2015/06/20 17:42:16]

Maybe say "constant blinding" instead of "diversification"? Because it isn't
being used for e.g. register randomization.

[qining, 2015/06/20 23:32:36]

Done.

+  RandomizationCookie =
+      (uint32_t)RNG.next((uint64_t)std::numeric_limits<uint32_t>::max + 1);
 }
 
 void GlobalContext::translateFunctions() {
@@ -753,7 +758,9 @@ ConstantList GlobalContext::getConstantPool(Type Ty) {
   switch (Ty) {
   case IceType_i1:
   case IceType_i8:
+    return getConstPool()->Integers8.getConstantPool();
   case IceType_i16:
+    return getConstPool()->Integers16.getConstantPool();
   case IceType_i32:
     return getConstPool()->Integers32.getConstantPool();
   case IceType_i64: