Add switch instruction to Subzero bitcode reader.

src/IceTypes.h

Index: src/IceTypes.h
diff --git a/src/IceTypes.h b/src/IceTypes.h
index 4127104f0b564592de67cafc761f8de221f87535..cc782ab59d1c24bdbe59bc9fa6ec5c1503631dce 100644
--- a/src/IceTypes.h
+++ b/src/IceTypes.h
@@ -66,6 +66,9 @@ bool isLoadStoreType(Type Ty);
 /// allowed.
 Type getCompareResultType(Type Ty);
 
+/// Returns the number of bits in a scalar integer type.
+SizeT getScalarIntBitWidth(Type Ty);
+
 template <typename StreamType>
 inline StreamType &operator<<(StreamType &Str, const Type &Ty) {
   Str << typeString(Ty);