Fix disassembly of pcmpgtq

pcmpgtq was added in https://crrev.com/c/1684362 but not to the
disasembler.

Bug: v8:8460
Change-Id: Id30f9ece015713e8597f5e218dc066ab75ccec96
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1703766Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62750}

src/diagnostics/x64/disasm-x64.cc

@@ -1684,6 +1684,7 @@ int DisassemblerX64::TwoByteOpcodeInstruction(byte* data) {
 
         SSSE3_INSTRUCTION_LIST(SSE34_DIS_CASE)
         SSE4_INSTRUCTION_LIST(SSE34_DIS_CASE)
+        SSE4_2_INSTRUCTION_LIST(SSE34_DIS_CASE)
 #undef SSE34_DIS_CASE
         default:
           UnimplementedInstruction();

test/cctest/test-disasm-x64.cc

@@ -606,6 +606,14 @@ TEST(DisasmX64) {
       SSE4_INSTRUCTION_LIST(EMIT_SSE34_INSTR)
     }
   }
+
+  {
+    if (CpuFeatures::IsSupported(SSE4_2)) {
+      CpuFeatureScope scope(&assm, SSE4_2);
+
+      SSE4_2_INSTRUCTION_LIST(EMIT_SSE34_INSTR)
+    }
+  }
 #undef EMIT_SSE34_INSTR
 
   // AVX instruction