Revert of [x64] Use vcvtlsi2sd when AVX is enabled

test/cctest/test-assembler-x64.cc

Index: test/cctest/test-assembler-x64.cc
diff --git a/test/cctest/test-assembler-x64.cc b/test/cctest/test-assembler-x64.cc
index e94aa29978f04bc9ae9f395f56e9ab6b57d011c5..86acfc9c2ff0500f8581d644cd44c8cf2f0f486b 100644
--- a/test/cctest/test-assembler-x64.cc
+++ b/test/cctest/test-assembler-x64.cc
@@ -1359,13 +1359,6 @@
     __ vmovsd(xmm5, Operand(rsp, kDoubleSize));
     __ vmovsd(xmm6, xmm5);
     __ vmovapd(xmm3, xmm6);
-
-    __ movl(rdi, Immediate(6));
-    __ vcvtlsi2sd(xmm6, xmm6, rdi);
-    __ movl(Operand(rsp, 0), Immediate(5));
-    __ vcvtlsi2sd(xmm7, xmm7, Operand(rsp, 0));
-    __ vsubsd(xmm7, xmm6, xmm7);  // xmm7 is 1.0
-    __ vmulsd(xmm1, xmm1, xmm7);
     __ addq(rsp, Immediate(kDoubleSize * 2));
 
     __ vucomisd(xmm3, xmm1);