remove most uses of Isolate::Current in arch specific files

src/arm/ic-arm.cc

Index: src/arm/ic-arm.cc
diff --git a/src/arm/ic-arm.cc b/src/arm/ic-arm.cc
index 511a3c74f26ccf19ee4aac6c755d583bdc2e1a83..f15d4b11f843bd22e43d67c5a4048d73ac2b54da 100644
--- a/src/arm/ic-arm.cc
+++ b/src/arm/ic-arm.cc
@@ -354,7 +354,7 @@ void CallICBase::GenerateMonomorphicCacheProbe(MacroAssembler* masm,
                                          extra_state,
                                          Code::NORMAL,
                                          argc);
-  Isolate::Current()->stub_cache()->GenerateProbe(
+  masm->isolate()->stub_cache()->GenerateProbe(
       masm, flags, r1, r2, r3, r4, r5, r6);
 
   // If the stub cache probing failed, the receiver might be a value.
@@ -393,7 +393,7 @@ void CallICBase::GenerateMonomorphicCacheProbe(MacroAssembler* masm,
 
   // Probe the stub cache for the value object.
   __ bind(&probe);
-  Isolate::Current()->stub_cache()->GenerateProbe(
+  masm->isolate()->stub_cache()->GenerateProbe(
       masm, flags, r1, r2, r3, r4, r5, r6);
 
   __ bind(&miss);
@@ -658,7 +658,7 @@ void LoadIC::GenerateMegamorphic(MacroAssembler* masm) {
   Code::Flags flags = Code::ComputeFlags(
       Code::STUB, MONOMORPHIC, Code::kNoExtraICState,
       Code::NORMAL, Code::LOAD_IC);
-  Isolate::Current()->stub_cache()->GenerateProbe(
+  masm->isolate()->stub_cache()->GenerateProbe(
       masm, flags, r0, r2, r3, r4, r5, r6);
 
   // Cache miss: Jump to runtime.
@@ -1490,7 +1490,7 @@ void StoreIC::GenerateMegamorphic(MacroAssembler* masm,
       Code::STUB, MONOMORPHIC, strict_mode,
       Code::NORMAL, Code::STORE_IC);
 
-  Isolate::Current()->stub_cache()->GenerateProbe(
+  masm->isolate()->stub_cache()->GenerateProbe(
       masm, flags, r1, r2, r3, r4, r5, r6);
 
   // Cache miss: Jump to runtime.