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

runtime/vm/stub_code_ia32.cc

Index: runtime/vm/stub_code_ia32.cc
diff --git a/runtime/vm/stub_code_ia32.cc b/runtime/vm/stub_code_ia32.cc
index d351ded34d5154d4c41e30a490505015dfbeba47..d5e7d9a1f1920ab6d4ce20123898684eaaf6332d 100644
--- a/runtime/vm/stub_code_ia32.cc
+++ b/runtime/vm/stub_code_ia32.cc
@@ -1967,11 +1967,10 @@ DECLARE_LEAF_RUNTIME_ENTRY(intptr_t,
 // Return ZF set.
 // Note: A Mint cannot contain a value that would fit in Smi, a Bigint
 // cannot contain a value that fits in Mint or Smi.
-void StubCode::GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
-                                                    const Register left,
-                                                    const Register right,
-                                                    const Register temp,
-                                                    const Register unused) {
+static void GenerateIdenticalWithNumberCheckStub(Assembler* assembler,
+                                                 const Register left,
+                                                 const Register right,
+                                                 const Register temp) {
   Label reference_compare, done, check_mint, check_bigint;
   // If any of the arguments is Smi do reference compare.
   __ testl(left, Immediate(kSmiTagMask));