Add support for the vbroadcastss instruction.

syzygy/core/disassembler_util.cc

Index: syzygy/core/disassembler_util.cc
diff --git a/syzygy/core/disassembler_util.cc b/syzygy/core/disassembler_util.cc
index 0cdf922fcbfeaf2d025abb7478c74fec051080c4..c5cdac8d3a7ee7d6a0b1cc1d60f43b7d14bb67c4 100644
--- a/syzygy/core/disassembler_util.cc
+++ b/syzygy/core/disassembler_util.cc
@@ -59,6 +59,7 @@ size_t Get3ByteVexEncodedInstructionSize(_CodeInfo* ci) {
     case 0x02: {
       switch (ci->code[3]) {
         case 0x13: return 5;  // vcvtps2ps
+        case 0x18: return 5;  // vbroadcastss
         case 0x36: return 5;  // vpermd
         case 0x5A: return 6;  // vbroadcasti128
         case 0x78: return 5;  // vpbroadcastb