VM: Store edge counters in one per-function array.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index fe30067f7227054c89c78a1fbb045219c3d47daf..f5fbb01b90d6fbf1aa2f80693dc2fea0ac62a59e 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -5388,13 +5388,10 @@ void GotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   __ Comment("GotoInstr");
   if (!compiler->is_optimizing()) {
     if (FLAG_emit_edge_counters) {
-      compiler->EmitEdgeCounter();
+      compiler->EmitEdgeCounter(block()->preorder_number());
     }
     // Add a deoptimization descriptor for deoptimizing instructions that
-    // may be inserted before this instruction.  On MIPS this descriptor
-    // points after the edge counter code so that we can reuse the same
-    // pattern matching code as at call sites, which matches backwards from
-    // the end of the pattern.
+    // may be inserted before this instruction.
     compiler->AddCurrentDescriptor(RawPcDescriptors::kDeopt,
                                    GetDeoptId(),
                                    Scanner::kNoSourcePos);