Revert "Fix some issues for deoptimizing runtime methods."

Reason for revert:
    Some tests still failing, reverting the original CL.

This reverts commit 57b4e13d9528a3ebac05db280be1df92a261cf79.

Change-Id: I49d9da676be7a1994b39ea9046c8d62695ff8422
diff --git a/runtime/interpreter/interpreter.cc b/runtime/interpreter/interpreter.cc
index 25d4dd6..943562c 100644
--- a/runtime/interpreter/interpreter.cc
+++ b/runtime/interpreter/interpreter.cc
@@ -562,7 +562,8 @@
         new_dex_pc = dex_pc + instr->SizeInCodeUnits();
       } else if (instr->Opcode() == Instruction::NEW_INSTANCE) {
         DCHECK(deopt_method_type == DeoptimizationMethodType::kDefault);
-        if (!first && value.GetL()->IsString()) {
+        if (value.GetL()->IsString()) {
+          DCHECK(!first);
           // It's possible to deoptimize at a NEW_INSTANCE dex instruction that's for a
           // java string, which is turned into a call into StringFactory.newEmptyString();
           // Move the StringFactory.newEmptyString() result into the destination register.
@@ -591,8 +592,7 @@
         // an invoke, so that we don't have to decode the dex instruction to move
         // result into the right vreg. All slow paths have been audited to be
         // idempotent except monitor-enter/exit and invocation stubs.
-        // TODO: move result and advance dex pc. That also requires that we can
-        // tell the return type of a runtime method, which we don't do currently.
+        // TODO: move result and advance dex pc.
         new_dex_pc = dex_pc;
       }
     } else {
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 4166454..20cfc34 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -207,8 +207,7 @@
         "variant": "trace | stream"
     },
     {
-        "tests": ["597-deopt-runtime-method",
-                  "604-hot-static-interface",
+        "tests": ["604-hot-static-interface",
                   "612-jit-dex-cache",
                   "613-inlining-dex-cache",
                   "626-set-resolved-string"],