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..5fc8e0c3434a0d906084f0bf62cac7d8c170ff9c 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 +266,11 @@ 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 constant blinding.
+  if (Flags.getRandomizeAndPoolImmediatesOption() != RPI_None)

[qining, 2015/06/20 23:32:37]

Add this flag to avoid using RNG. This keeps the random numbers used in
nop-insertion and randomize-regalloc tests unchanged.

[Jim Stichnoth, 2015/06/21 00:05:27]

Good, but please add a comment briefly explaining the issue and a TODO to fix it
along with other RNG refactoring.

[qining, 2015/06/21 00:30:47]

Done.

+    RandomizationCookie =
+        (uint32_t)RNG.next((uint64_t)std::numeric_limits<uint32_t>::max + 1);
 }
 
 void GlobalContext::translateFunctions() {
@@ -753,7 +759,9 @@ 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: