Remove default monomorphic check code from functions and stubs that do not need it.

runtime/vm/stub_code_arm64.cc

Index: runtime/vm/stub_code_arm64.cc
diff --git a/runtime/vm/stub_code_arm64.cc b/runtime/vm/stub_code_arm64.cc
index 7211745eb147e6b4492b478c7dd44f86ee561fbc..443ab1cece5b3f4168f3586a8e050116366147aa 100644
--- a/runtime/vm/stub_code_arm64.cc
+++ b/runtime/vm/stub_code_arm64.cc
@@ -2073,8 +2073,6 @@ void StubCode::GenerateOptimizedIdenticalWithNumberCheckStub(
 //  CODE_REG: target Code
 //  R4: arguments descriptor
 void StubCode::GenerateMegamorphicCallStub(Assembler* assembler) {
-  __ NoMonomorphicCheckedEntry();
-
   // Jump if receiver is a smi.
   Label smi_case;
   __ TestImmediate(R0, kSmiTagMask);
@@ -2148,8 +2146,6 @@ void StubCode::GenerateMegamorphicCallStub(Assembler* assembler) {
 //  CODE_REG: target Code object
 //  R4: arguments descriptor
 void StubCode::GenerateICCallThroughFunctionStub(Assembler* assembler) {
-  __ NoMonomorphicCheckedEntry();
-
   Label loop, found, miss;
   __ ldr(R4, FieldAddress(R5, ICData::arguments_descriptor_offset()));
   __ ldr(R8, FieldAddress(R5, ICData::ic_data_offset()));
@@ -2185,8 +2181,6 @@ void StubCode::GenerateICCallThroughFunctionStub(Assembler* assembler) {
 
 
 void StubCode::GenerateICCallThroughCodeStub(Assembler* assembler) {
-  __ NoMonomorphicCheckedEntry();
-
   Label loop, found, miss;
   __ ldr(R4, FieldAddress(R5, ICData::arguments_descriptor_offset()));
   __ ldr(R8, FieldAddress(R5, ICData::ic_data_offset()));
@@ -2225,8 +2219,6 @@ void StubCode::GenerateICCallThroughCodeStub(Assembler* assembler) {
 //  R0: receiver
 //  R5: SingleTargetCache
 void StubCode::GenerateUnlinkedCallStub(Assembler* assembler) {
-  __ NoMonomorphicCheckedEntry();
-
   __ EnterStubFrame();
   __ Push(R0);  // Preserve receiver.
 
@@ -2252,10 +2244,7 @@ void StubCode::GenerateUnlinkedCallStub(Assembler* assembler) {
 // Passed to target:
 //  CODE_REG: target Code object
 void StubCode::GenerateSingleTargetCallStub(Assembler* assembler) {
-  __ NoMonomorphicCheckedEntry();
-
   Label miss;
-
   __ LoadClassIdMayBeSmi(R1, R0);
   __ ldr(R2, FieldAddress(R5, SingleTargetCache::lower_limit_offset()),
          kUnsignedWord);