VM: Fix more places with isolate embedded into unoptimized code.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index 07a8242612860fe3b0fe32b70f5cb15f36687814..cc211bb46cfeb3b2ab6f40f637691992a0e10d34 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -2752,8 +2752,13 @@ void CheckStackOverflowInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   CheckStackOverflowSlowPath* slow_path = new CheckStackOverflowSlowPath(this);
   compiler->AddSlowPathCode(slow_path);
 
-  __ LoadImmediate(TMP, Isolate::Current()->stack_limit_address());
-  __ lw(CMPRES1, Address(TMP));
+  if (compiler->is_optimizing()) {
+    __ LoadImmediate(TMP, Isolate::Current()->stack_limit_address());
+    __ lw(CMPRES1, Address(TMP));
+  } else {
+    __ LoadIsolate(TMP);
+    __ lw(CMPRES1, Address(TMP, Isolate::stack_limit_offset()));
+  }
   __ BranchUnsignedLessEqual(SP, CMPRES1, slow_path->entry_label());
   if (compiler->CanOSRFunction() && in_loop()) {
     Register temp = locs()->temp(0).reg();