Add support for vector types and vector constants.

src/IceDefs.h

Index: src/IceDefs.h
diff --git a/src/IceDefs.h b/src/IceDefs.h
index 4c616f832bb68c19cb67412c91483c6a91c297a4..266ff7248d25cb40d4175092cc74e908384fd009 100644
--- a/src/IceDefs.h
+++ b/src/IceDefs.h
@@ -29,6 +29,7 @@
 
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/SmallBitVector.h"
+#include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h" // LLVM_STATIC_ASSERT
@@ -64,6 +65,12 @@ typedef std::list<InstPhi *> PhiList;
 typedef std::vector<Variable *> VarList;
 typedef std::vector<CfgNode *> NodeList;
 typedef std::vector<Constant *> ConstantList;
+typedef std::vector<IceString> StringList;
+// TODO(wala): Switch to std::array after C++11

[Jim Stichnoth, 2014/06/27 18:30:16]

Assign this TODO to me instead, not sure you'll get to it. :)

+typedef llvm::SmallVector<char, 16> Vect128;

[Jim Stichnoth, 2014/06/27 18:30:16]

Can/should you use VECT128_BYTES instead of 16 on these two lines?

[wala, 2014/06/27 21:09:19]

It makes sense for Vect128, which should have 16 bytes and always be fixed
width.

BitVect is not fixed width. 16 is the largest possible value for the size of
BitVect but I'm unsure if it's the right amount to preallocate.

+typedef llvm::SmallVector<bool, 16> BitVect;
+
+const unsigned VECT128_BYTES = 16;
 
 // SizeT is for holding small-ish limits like number of source
 // operands in an instruction.  It is used instead of size_t (which