v8: integrate node-heapdump into core

Adds `v8.writeHeapSnapshot(filename)` with impl adapted
from the `node-heapdump` module.

Also, adds a v8.getHeapSnapshot() alternative that returns
a Readable Stream

PR-URL: https://github.com/nodejs/node/pull/26501
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/env.h b/src/env.h
index ce0d610167..2c61082c5f 100644
--- a/src/env.h
+++ b/src/env.h
@@ -383,6 +383,7 @@ constexpr size_t kFsStatsBufferLength = kFsStatsFieldsNumber * 2;
   V(script_data_constructor_function, v8::Function)                            \
   V(secure_context_constructor_template, v8::FunctionTemplate)                 \
   V(shutdown_wrap_template, v8::ObjectTemplate)                                \
+  V(streambaseoutputstream_constructor_template, v8::ObjectTemplate)           \
   V(tcp_constructor_template, v8::FunctionTemplate)                            \
   V(tick_callback_function, v8::Function)                                      \
   V(timers_callback_function, v8::Function)                                    \