Initial SIMDBC interpreter.

runtime/vm/precompiler.cc

Index: runtime/vm/precompiler.cc
diff --git a/runtime/vm/precompiler.cc b/runtime/vm/precompiler.cc
index c1fa12865a29ee33bd518b4b548108b141a268e8..536092e83db28ae09aa45ac6bd48320cb163d40d 100644
--- a/runtime/vm/precompiler.cc
+++ b/runtime/vm/precompiler.cc
@@ -1721,6 +1721,7 @@ void Precompiler::BindStaticCalls() {
 
 
 void Precompiler::SwitchICCalls() {
+#if !defined(TARGET_ARCH_DBC)
   // Now that all functions have been compiled, we can switch to an instance
   // call sequence that loads the Code object and entry point directly from
   // the ic data array instead indirectly through a Function in the ic data
@@ -1794,6 +1795,7 @@ void Precompiler::SwitchICCalls() {
   ASSERT(!I->compilation_allowed());
   SwitchICCallsVisitor visitor(Z);
   VisitFunctions(&visitor);
+#endif
 }