PPC [simd]: Add Simd as a feature to PowerPC

Simd implementations on Power need P9 at a minimum.
Feature is enabled on the simulator regardless of the host.

Change-Id: I06bbfea11615457f5d837fe00c3dfe36b277d82b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2787490Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Zhi An Ng <zhin@chromium.org>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73726}

src/codegen/cpu-features.h

@@ -58,6 +58,7 @@ enum CpuFeature {
   ISELECT,
   VSX,
   MODULO,
+  SIMD,
 
 #elif V8_TARGET_ARCH_S390X
   FPU,

src/codegen/ppc/assembler-ppc.cc

@@ -77,6 +77,10 @@ void CpuFeatures::ProbeImpl(bool cross_compile) {
       cpu.part() == base::CPU::PPC_POWER9) {
     supported_ |= (1u << FPR_GPR_MOV);
   }
+  // V8 PPC Simd implementations need P9 at a minimum.
+  if (cpu.part() == base::CPU::PPC_POWER9) {
+    supported_ |= (1u << SIMD);
+  }
 #endif
   if (cpu.part() == base::CPU::PPC_POWER6 ||
       cpu.part() == base::CPU::PPC_POWER7 ||
@@ -108,6 +112,7 @@ void CpuFeatures::ProbeImpl(bool cross_compile) {
   supported_ |= (1u << ISELECT);
   supported_ |= (1u << VSX);
   supported_ |= (1u << MODULO);
+  supported_ |= (1u << SIMD);
 #if V8_TARGET_ARCH_PPC64
   supported_ |= (1u << FPR_GPR_MOV);
 #endif