[Interpreter] Replace BytecodeRegisterAllocator with a simple bump pointer.

src/interpreter/mkpeephole.cc

Index: src/interpreter/mkpeephole.cc
diff --git a/src/interpreter/mkpeephole.cc b/src/interpreter/mkpeephole.cc
index 8e9d5fea478fa74335e9d24a9c571a6ef2fe7638..270fe83ef9c3a7dcb59d76d6d559f8a0f78be523 100644
--- a/src/interpreter/mkpeephole.cc
+++ b/src/interpreter/mkpeephole.cc
@@ -146,6 +146,9 @@ PeepholeActionAndData PeepholeActionTableWriter::LookupActionAndData(
             Bytecode::kIllegal};
   }
 
+  // TODO(rmcilroy): Add elide for consecutive mov to and from the same
+  // register.
+
   // Remove ToBoolean coercion from conditional jumps where possible.
   if (Bytecodes::WritesBooleanToAccumulator(last)) {
     if (Bytecodes::IsJumpIfToBoolean(current)) {