Small fixes for AVX disassembly

Add missing disasm tests for vroundss and vpalignr.
Fix disasm for vinsertps and vpinsrq.

Change-Id: I0f3907761b998d27ec00435a569084724af54ae2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1990140Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65799}

src/diagnostics/x64/disasm-x64.cc

@@ -989,12 +989,12 @@ int DisassemblerX64::AVXInstruction(byte* data) {
       case 0x21:
         AppendToBuffer("vinsertps %s,%s,", NameOfXMMRegister(regop),
                        NameOfXMMRegister(vvvv));
-        current += PrintRightByteOperand(current);
+        current += PrintRightXMMOperand(current);
         AppendToBuffer(",0x%x", *current++);
         break;
       case 0x22:
-        AppendToBuffer("vpinsrd %s,%s,", NameOfXMMRegister(regop),
-                       NameOfXMMRegister(vvvv));
+        AppendToBuffer("vpinsr%c %s,%s,", rex_w() ? 'q' : 'd',
+                       NameOfXMMRegister(regop), NameOfXMMRegister(vvvv));
         current += PrintRightOperand(current);
         AppendToBuffer(",0x%x", *current++);
         break;

test/cctest/test-disasm-x64.cc

@@ -637,6 +637,7 @@ TEST(DisasmX64) {
       __ vminsd(xmm9, xmm1, Operand(rbx, rcx, times_8, 10000));
       __ vmaxsd(xmm8, xmm1, xmm2);
       __ vmaxsd(xmm9, xmm1, Operand(rbx, rcx, times_1, 10000));
+      __ vroundss(xmm9, xmm1, xmm2, kRoundDown);
       __ vroundsd(xmm8, xmm3, xmm0, kRoundDown);
       __ vsqrtsd(xmm8, xmm1, xmm2);
       __ vsqrtsd(xmm9, xmm1, Operand(rbx, rcx, times_1, 10000));