S390: enable VEF2 on the simulator

This enables running some of the new instructions on the simulator
including vcgd and vclgd.

Change-Id: Icd1c6ced124aec8608dece855f85ba350c4247fd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2976027Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#75281}

src/codegen/s390/assembler-s390.cc

@@ -247,6 +247,7 @@ void CpuFeatures::ProbeImpl(bool cross_compile) {
   USE(supportsCPUFeature);
   supported_ |= (1u << VECTOR_FACILITY);
   supported_ |= (1u << VECTOR_ENHANCE_FACILITY_1);
+  supported_ |= (1u << VECTOR_ENHANCE_FACILITY_2);
 #endif
   supported_ |= (1u << FPU);