Introduction of improved switch lowering.

src/IceTargetLoweringX8632.cpp

Index: src/IceTargetLoweringX8632.cpp
diff --git a/src/IceTargetLoweringX8632.cpp b/src/IceTargetLoweringX8632.cpp
index 0d9572a9207d896b46ffd4e601295768f37ec737..89d60bff7abb0b32779fd3c9818a1ac94e49220d 100644
--- a/src/IceTargetLoweringX8632.cpp
+++ b/src/IceTargetLoweringX8632.cpp
@@ -335,7 +335,7 @@ enum _tmp_enum {
       _num
 };
 // Define a set of constants based on high-level table entries.
-#define X(tag, size, align, elts, elty, str)                                   \
+#define X(tag, size, sizeLog2, align, elts, elty, str)                         \
   static const int _table1_##tag = tag;
 ICETYPE_TABLE
 #undef X
@@ -349,7 +349,7 @@ ICETYPEX8632_TABLE
 #undef X
 // Repeat the static asserts with respect to the high-level table
 // entries in case the high-level table has extra entries.
-#define X(tag, size, align, elts, elty, str)                                   \
+#define X(tag, size, sizeLog2, align, elts, elty, str)                         \
   static_assert(_table1_##tag == _table2_##tag,                                \
                 "Inconsistency between ICETYPEX8632_TABLE and ICETYPE_TABLE");
 ICETYPE_TABLE