Introduce LanguageMode, drop StrictMode.

src/ic/arm64/ic-compiler-arm64.cc

Index: src/ic/arm64/ic-compiler-arm64.cc
diff --git a/src/ic/arm64/ic-compiler-arm64.cc b/src/ic/arm64/ic-compiler-arm64.cc
index a3d0d481fed4e515416eaea8cdce939a9f5547de..6883374862e8703be6550bac47adc971e1caa86f 100644
--- a/src/ic/arm64/ic-compiler-arm64.cc
+++ b/src/ic/arm64/ic-compiler-arm64.cc
@@ -14,14 +14,14 @@ namespace internal {
 
 #define __ ACCESS_MASM(masm)
 
-void PropertyICCompiler::GenerateRuntimeSetProperty(MacroAssembler* masm,
-                                                    StrictMode strict_mode) {
+void PropertyICCompiler::GenerateRuntimeSetProperty(
+    MacroAssembler* masm, LanguageMode language_mode) {
   ASM_LOCATION("PropertyICCompiler::GenerateRuntimeSetProperty");
 
   __ Push(StoreDescriptor::ReceiverRegister(), StoreDescriptor::NameRegister(),
           StoreDescriptor::ValueRegister());
 
-  __ Mov(x10, Smi::FromInt(strict_mode));
+  __ Mov(x10, Smi::FromInt(language_mode));
   __ Push(x10);
 
   // Do tail-call to runtime routine.