Revert asserting only 1 arg ICs are generated in precompilation.

runtime/vm/precompiler.cc

Index: runtime/vm/precompiler.cc
diff --git a/runtime/vm/precompiler.cc b/runtime/vm/precompiler.cc
index dcf3519c1d8c11322b00e788a3a64fdcbe6c7b7b..afb280423afdfa424a5f7cf194370b9eaa6371a5 100644
--- a/runtime/vm/precompiler.cc
+++ b/runtime/vm/precompiler.cc
@@ -1932,9 +1932,7 @@ void Precompiler::SwitchICCalls() {
         if (entry_.IsICData()) {
           ic_ ^= entry_.raw();
 
-          // SwitchableCalls use single-check ICs. No other kind of IC call is
-          // generated in precompilation mode.
-          ASSERT(ic_.NumArgsTested() == 1);
+          if (ic_.NumArgsTested() != 1) continue;

[Florian Schneider, 2016/08/12 17:56:29]

So we do still use ICs with >1 argument checks?

 
           for (intptr_t j = 0; j < ic_.NumberOfChecks(); j++) {
             entry_ = ic_.GetTargetOrCodeAt(j);