[interpreter] Add basic framework for bytecode handler code generation.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 434b7b8ce9e83ca5b06028dc096ae769cb3144f4..96d3d28d99be1c7f83f3469a1137fa83f8707d87 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -712,6 +712,8 @@ source_set("v8_base") {
     "src/compiler/instruction-selector.h",
     "src/compiler/instruction.cc",
     "src/compiler/instruction.h",
+    "src/compiler/interpreter-assembler.cc",
+    "src/compiler/interpreter-assembler.h",
     "src/compiler/js-builtin-reducer.cc",
     "src/compiler/js-builtin-reducer.h",
     "src/compiler/js-context-relaxation.cc",
@@ -995,6 +997,10 @@ source_set("v8_base") {
     "src/interface-descriptors.h",
     "src/interpreter-irregexp.cc",
     "src/interpreter-irregexp.h",
+    "src/interpreter/bytecodes.cc",
+    "src/interpreter/bytecodes.h",
+    "src/interpreter/interpreter.cc",
+    "src/interpreter/interpreter.h",
     "src/isolate.cc",
     "src/isolate.h",
     "src/json-parser.h",