Adds support for ARMv6.

runtime/vm/assembler_arm_test.cc

Index: runtime/vm/assembler_arm_test.cc
===================================================================
--- runtime/vm/assembler_arm_test.cc	(revision 33351)
+++ runtime/vm/assembler_arm_test.cc	(working copy)
@@ -59,9 +59,25 @@
 
 
 ASSEMBLER_TEST_GENERATE(MovImm16, assembler) {
-  __ movw(R0, 0x5678);
-  __ movt(R0, 0x1234);
+#if defined(USING_SIMULATOR)
+  // ARMv7 is the default.
+  HostCPUFeatures::set_arm_version(ARMv6);
+  __ LoadLargeImmediate(R0, 0x12345678 << 1);

[regis, 2014/03/06 17:32:11]

LoadDecodableImmediate

[zra, 2014/03/07 19:00:17]

Done.

+  HostCPUFeatures::set_arm_version(ARMv7);
+  __ movw(R1, 0x5678);
+  __ movt(R1, 0x1234);
+  __ sub(R0, R0, ShifterOperand(R1));
   __ bx(LR);
+#else
+  if (TargetCPUFeatures::arm_version() == ARMv6) {
+    __ LoadLargeImmediate(R0, 0x12345678);
+  } else {
+    ASSERT(TargetCPUFeatures::arm_version() == ARMv7);
+    __ movw(R0, 0x5678);
+    __ movt(R0, 0x1234);
+    __ bx(LR);

[regis, 2014/03/06 17:32:11]

__ bx(LR) should be outside of the branch.

Remove the version check anyway:

#else
  __ LoadDecodableImmediate(R0, 0x12345678);
  __ bx(LR);
#endif

[zra, 2014/03/07 19:00:17]

Done.

+  }
+#endif
 }