ARM: Make use of d16-d31 when available.

src/mips/assembler-mips.cc

Index: src/mips/assembler-mips.cc
diff --git a/src/mips/assembler-mips.cc b/src/mips/assembler-mips.cc
index 1ca4d525da82fd715cf4fb76e2603cdbc8fd3c54..962255dacdf2f1b5d3f616a50d7798f9f35c7dd0 100644
--- a/src/mips/assembler-mips.cc
+++ b/src/mips/assembler-mips.cc
@@ -50,6 +50,12 @@ unsigned CpuFeatures::supported_ = 0;
 unsigned CpuFeatures::found_by_runtime_probing_ = 0;
 
 
+ExternalReference ExternalReference::cpu_features() {
+  ASSERT(CpuFeatures::initialized_);
+  return ExternalReference(&CpuFeatures::supported_);
+}
+
+
 // Get the CPU features enabled by the build. For cross compilation the
 // preprocessor symbols CAN_USE_FPU_INSTRUCTIONS
 // can be defined to enable FPU instructions when building the