Revert "VM: New calling convention for generated code."

runtime/vm/intermediate_language_arm64.cc

Index: runtime/vm/intermediate_language_arm64.cc
diff --git a/runtime/vm/intermediate_language_arm64.cc b/runtime/vm/intermediate_language_arm64.cc
index 39efe6e20c472f78e0ec5a71583aa3ef1b43fec6..7ae62c03ef4991e398c4dca35528622f2d16feb9 100644
--- a/runtime/vm/intermediate_language_arm64.cc
+++ b/runtime/vm/intermediate_language_arm64.cc
@@ -219,13 +219,11 @@ void ClosureCallInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   // R4: Arguments descriptor.
   // R0: Function.
   ASSERT(locs()->in(0).reg() == R0);
-  __ LoadFieldFromOffset(CODE_REG, R0, Function::code_offset());
   __ LoadFieldFromOffset(R2, R0, Function::entry_point_offset());
 
   // R2: instructions.
   // R5: Smi 0 (no IC data; the lazy-compile stub expects a GC-safe value).
   __ LoadImmediate(R5, 0);
-  //??
   __ blr(R2);
   compiler->RecordSafepoint(locs());
   // Marks either the continuation point in unoptimized code or the
@@ -2557,7 +2555,6 @@ void CatchBlockEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
                                 needs_stacktrace());
 
   // Restore the pool pointer.
-  __ RestoreCodePointer();
   __ LoadPoolPointer();
 
   if (HasParallelMove()) {
@@ -5459,14 +5456,8 @@ LocationSummary* IndirectGotoInstr::MakeLocationSummary(Zone* zone,
 void IndirectGotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register target_address_reg = locs()->temp_slot(0)->reg();
 
-  // Load code entry point.
-  const intptr_t entry_offset = __ CodeSize();
-  if (Utils::IsInt(21, -entry_offset)) {
-    __ adr(target_address_reg, Immediate(-entry_offset));
-  } else {
-    __ adr(target_address_reg, Immediate(0));
-    __ AddImmediate(target_address_reg, target_address_reg, -entry_offset);
-  }
+  // Load from [current frame pointer] + kPcMarkerSlotFromFp.
+  __ ldr(target_address_reg, Address(FP, kPcMarkerSlotFromFp * kWordSize));
 
   // Add the offset.
   Register offset_reg = locs()->in(0).reg();