[Simd128] Add CpuFeatures::SupportsSimd128 method.

All architectures return false for now.

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2135573003
Cr-Commit-Position: refs/heads/master@{#37649}

src/arm/assembler-arm-inl.h

@@ -46,9 +46,9 @@
 namespace v8 {
 namespace internal {
 
-
 bool CpuFeatures::SupportsCrankshaft() { return IsSupported(VFP3); }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 int DoubleRegister::NumRegisters() {
   return CpuFeatures::IsSupported(VFP32DREGS) ? 32 : 16;

src/arm64/assembler-arm64-inl.h

@@ -16,6 +16,7 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return true; }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 void RelocInfo::apply(intptr_t delta) {
   // On arm64 only internal references need extra work.

src/assembler.h

@@ -225,6 +225,8 @@ class CpuFeatures : public AllStatic {
 
   static inline bool SupportsCrankshaft();
 
+  static inline bool SupportsSimd128();
+
   static inline unsigned icache_line_size() {
     DCHECK(icache_line_size_ != 0);
     return icache_line_size_;

src/ia32/assembler-ia32-inl.h

@@ -47,6 +47,7 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return true; }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 static const byte kCallOpcode = 0xE8;
 static const int kNoCodeAgeSequenceLength = 5;

src/mips/assembler-mips-inl.h

@@ -49,6 +49,7 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return IsSupported(FPU); }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 // -----------------------------------------------------------------------------
 // Operand and MemOperand.

src/mips64/assembler-mips64-inl.h

@@ -49,6 +49,7 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return IsSupported(FPU); }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 // -----------------------------------------------------------------------------
 // Operand and MemOperand.

src/ppc/assembler-ppc-inl.h

@@ -49,6 +49,7 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return true; }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 void RelocInfo::apply(intptr_t delta) {
   // absolute code pointer inside code object moves with the code object.

src/s390/assembler-s390-inl.h

@@ -47,6 +47,8 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return true; }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
+
 void RelocInfo::apply(intptr_t delta) {
   // Absolute code pointer inside code object moves with the code object.
   if (IsInternalReference(rmode_)) {

src/x64/assembler-x64-inl.h

@@ -16,6 +16,7 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return true; }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 // -----------------------------------------------------------------------------
 // Implementation of Assembler

src/x87/assembler-x87-inl.h

@@ -47,6 +47,7 @@ namespace internal {
 
 bool CpuFeatures::SupportsCrankshaft() { return true; }
 
+bool CpuFeatures::SupportsSimd128() { return false; }
 
 static const byte kCallOpcode = 0xE8;
 static const int kNoCodeAgeSequenceLength = 5;