Add a few Subzero intrinsics (not the atomic ones yet).

src/IceGlobalContext.cpp

Index: src/IceGlobalContext.cpp
diff --git a/src/IceGlobalContext.cpp b/src/IceGlobalContext.cpp
index d77a5ddb554c4e1f3ec68232da712a6cc72152d3..1d050397a0b2333a8ebe20e80eeec38891bfd065 100644
--- a/src/IceGlobalContext.cpp
+++ b/src/IceGlobalContext.cpp
@@ -94,7 +94,9 @@ GlobalContext::GlobalContext(llvm::raw_ostream *OsDump,
                              IceString TestPrefix)
     : StrDump(OsDump), StrEmit(OsEmit), VMask(Mask),
       ConstPool(new ConstantPool()), Arch(Arch), Opt(Opt),
-      TestPrefix(TestPrefix), HasEmittedFirstMethod(false) {}
+      TestPrefix(TestPrefix), HasEmittedFirstMethod(false) {
+  BuildIntrinsicMap(&IntrinsicInfos);
+}
 
 // In this context, name mangling means to rewrite a symbol using a
 // given prefix.  For a C++ symbol, nest the original symbol inside
@@ -210,6 +212,13 @@ ConstantList GlobalContext::getConstantPool(Type Ty) const {
   llvm_unreachable("Unknown type");
 }
 
+IntrinsicInfo GlobalContext::getIntrinsicInfo(const IceString &Name) const {
+  IntrinsicMap::const_iterator I = IntrinsicInfos.find(Name);
+  if (I == IntrinsicInfos.end())
+    return UnknownIntrinsicInfo;
+  return I->second;
+}
+
 void Timer::printElapsedUs(GlobalContext *Ctx, const IceString &Tag) const {
   if (Ctx->isVerbose(IceV_Timing)) {
     // Prefixing with '#' allows timing strings to be included