[assembler] Introduce proper AssemblerBase::Print() for improved debuggability.

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index e9e75744b10e2b0493152da329c120a9b1165eda..8571f33176033797785d6dfc20abab9f88f7e57f 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -46,9 +46,11 @@
 #include "src/counters.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
+#include "src/disassembler.h"
 #include "src/execution.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
+#include "src/ostreams.h"
 #include "src/profiler/cpu-profiler.h"
 #include "src/regexp/jsregexp.h"
 #include "src/regexp/regexp-macro-assembler.h"
@@ -215,6 +217,12 @@ void AssemblerBase::FlushICacheWithoutIsolate(void* start, size_t size) {
 }
 
 
+void AssemblerBase::Print() {
+  OFStream os(stdout);
+  v8::internal::Disassembler::Decode(isolate(), &os, buffer_, pc_, nullptr);
+}
+
+
 // -----------------------------------------------------------------------------
 // Implementation of PredictableCodeSizeScope