Revert experimental lambda feature.

This is a revert of the following changes :

30c475a2046951a81769c2db0b2dad66cd71e189.
lambda: Minor capture-variable/liberate-variable clean-up after post-merge reviews.

6918bf13eb855b3aa8ccdddda2d27ae8c60cec56.
lambda: Experimental support for capture-variable and liberate-variable

fc1ccd740b7c8e96dfac675cfc580122cd1b40a6.
lambda: Infrastructure to support capture/liberate-variable dex opcodes

e2facc5b18cd756a8b5500fb3d90da69c9ee0fb7.
runtime: Add lambda box/unbox object equality

2ee54e249ad21c74f29a161e248bebe7d22fddf1.
runtime: Partially implement box-lambda and unbox-lambda experimental opcodes

158f35c98e2ec0d40d2c032b8cdce5fb60944a7f.
interpreter: Add experimental lambda opcodes for invoke/create-lambda

a3bb72036f5454e410467f7151dc89f725ae1151.
Added format 25x to dexdump(2).

Plus surrounding cleanups.

Test: make test-art
Change-Id: Ic6f999ad17385ef933f763641049cf721510b202
diff --git a/runtime/experimental_flags.h b/runtime/experimental_flags.h
index 198f3fa..fde1a5f 100644
--- a/runtime/experimental_flags.h
+++ b/runtime/experimental_flags.h
@@ -26,7 +26,6 @@
   // The actual flag values.
   enum {
     kNone           = 0x0000,
-    kLambdas        = 0x0001,
   };
 
   constexpr ExperimentalFlags() : value_(0x0000) {}
@@ -62,15 +61,9 @@
   uint32_t value_;
 };
 
-inline std::ostream& operator<<(std::ostream& stream, const ExperimentalFlags& e) {
-  bool started = false;
-  if (e & ExperimentalFlags::kLambdas) {
-    stream << (started ? "|" : "") << "kLambdas";
-    started = true;
-  }
-  if (!started) {
-    stream << "kNone";
-  }
+inline std::ostream& operator<<(std::ostream& stream,
+                                const ExperimentalFlags& e ATTRIBUTE_UNUSED) {
+  stream << "kNone";
   return stream;
 }