Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/debugger.cc

Index: runtime/vm/debugger.cc
diff --git a/runtime/vm/debugger.cc b/runtime/vm/debugger.cc
index 6b50583c2c8ced0fb091c69788705bccde454aa5..155512ad4fd4b1c7e5e849f3baa3cfaaa4033002 100644
--- a/runtime/vm/debugger.cc
+++ b/runtime/vm/debugger.cc
@@ -519,7 +519,7 @@ TokenPosition ActivationFrame::TokenPos() {
     token_pos_ = TokenPosition::kNoSource;
     GetPcDescriptors();
     PcDescriptors::Iterator iter(pc_desc_, RawPcDescriptors::kAnyKind);
-    uword pc_offset = pc_ - code().EntryPoint();
+    uword pc_offset = pc_ - code().PayloadStart();
     while (iter.MoveNext()) {
       if (iter.PcOffset() == pc_offset) {
         try_index_ = iter.TryIndex();
@@ -1528,7 +1528,7 @@ DebuggerStackTrace* Debugger::StackTraceFrom(const Stacktrace& ex_trace) {
     if (!function.IsNull() && function.is_visible()) {
       code = ex_trace.CodeAtFrame(i);
       ASSERT(function.raw() == code.function());
-      uword pc = code.EntryPoint() + Smi::Value(ex_trace.PcOffsetAtFrame(i));
+      uword pc = code.PayloadStart() + Smi::Value(ex_trace.PcOffsetAtFrame(i));
       if (code.is_optimized() && ex_trace.expand_inlined()) {
         // Traverse inlined frames.
         for (InlinedFunctionsIterator it(code, pc); !it.Done(); it.Advance()) {
@@ -1537,8 +1537,8 @@ DebuggerStackTrace* Debugger::StackTraceFrom(const Stacktrace& ex_trace) {
           ASSERT(function.raw() == code.function());
           uword pc = it.pc();
           ASSERT(pc != 0);
-          ASSERT(code.EntryPoint() <= pc);
-          ASSERT(pc < (code.EntryPoint() + code.Size()));
+          ASSERT(code.PayloadStart() <= pc);
+          ASSERT(pc < (code.PayloadStart() + code.Size()));
 
           ActivationFrame* activation = new ActivationFrame(
             pc, fp, sp, code, deopt_frame, deopt_frame_offset);
@@ -1828,7 +1828,7 @@ void Debugger::MakeCodeBreakpointAt(const Function& func,
   if (lowest_pc_offset == kUwordMax) {
     return;
   }
-  uword lowest_pc = code.EntryPoint() + lowest_pc_offset;
+  uword lowest_pc = code.PayloadStart() + lowest_pc_offset;
   CodeBreakpoint* code_bpt = GetCodeBreakpoint(lowest_pc);
   if (code_bpt == NULL) {
     // No code breakpoint for this code exists; create one.