Adds support for ARMv6.

runtime/vm/cpu_arm.cc

Index: runtime/vm/cpu_arm.cc
===================================================================
--- runtime/vm/cpu_arm.cc	(revision 33437)
+++ runtime/vm/cpu_arm.cc	(working copy)
@@ -54,6 +54,7 @@
 bool HostCPUFeatures::integer_division_supported_ = false;
 bool HostCPUFeatures::neon_supported_ = false;
 const char* HostCPUFeatures::hardware_ = NULL;
+ARMVersion HostCPUFeatures::arm_version_ = ARMvUnknown;
 #if defined(DEBUG)
 bool HostCPUFeatures::initialized_ = false;
 #endif
@@ -63,12 +64,20 @@
 void HostCPUFeatures::InitOnce() {
   CpuInfo::InitOnce();
   hardware_ = CpuInfo::GetCpuModel();
-  // Implements ARMv7.
-  ASSERT(CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv7"));
+  // Check for ARMv6 or ARMv7. It can be in either the Processor or
+  // Model information fields.
+  if (CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv6") ||
+      CpuInfo::FieldContains(kCpuInfoModel, "ARMv6")) {
+    arm_version_ = ARMv6;
+  } else {
+    ASSERT(CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv7") ||
+           CpuInfo::FieldContains(kCpuInfoModel, "ARMv7"));
+    arm_version_ = ARMv7;
+  }
   // Has floating point unit.
   ASSERT(CpuInfo::FieldContains(kCpuInfoFeatures, "vfp"));
   // Has integer division.
-  bool is_krait = CpuInfo::FieldContains(kCpuInfoModel, "QCT APQ8064");
+  bool is_krait = CpuInfo::FieldContains(kCpuInfoHardware, "QCT APQ8064");
   if (is_krait) {
     // Special case for Qualcomm Krait CPUs in Nexus 4 and 7.
     integer_division_supported_ = true;
@@ -101,6 +110,7 @@
   hardware_ = CpuInfo::GetCpuModel();
   integer_division_supported_ = true;
   neon_supported_ = true;
+  arm_version_ = ARMv7;
 #if defined(DEBUG)
   initialized_ = true;
 #endif