Prepare to rename RTC_NOTREACHED to RTC_DCHECK_NOTREACHED

Add implementation of RTC_DCHECK_NOTREACHED equal to the RTC_NOTREACHED.
The new macros will replace the old one when old one's usage will be
removed. The idea of the renaming to provide a clear signal that this
is debug build only macros and will be stripped in the production build.

Bug: webrtc:9065
Change-Id: I4c35d8b03e74a4b3fd1ae75dba2f9c05643101db
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/237802
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35348}
diff --git a/api/rtp_transceiver_interface.cc b/api/rtp_transceiver_interface.cc
index fd5085c..454e450 100644
--- a/api/rtp_transceiver_interface.cc
+++ b/api/rtp_transceiver_interface.cc
@@ -34,17 +34,19 @@
 }
 
 RTCError RtpTransceiverInterface::StopStandard() {
-  RTC_NOTREACHED() << "DEBUG: RtpTransceiverInterface::StopStandard called";
+  RTC_DCHECK_NOTREACHED()
+      << "DEBUG: RtpTransceiverInterface::StopStandard called";
   return RTCError::OK();
 }
 
 void RtpTransceiverInterface::StopInternal() {
-  RTC_NOTREACHED() << "DEBUG: RtpTransceiverInterface::StopInternal called";
+  RTC_DCHECK_NOTREACHED()
+      << "DEBUG: RtpTransceiverInterface::StopInternal called";
 }
 
 RTCError RtpTransceiverInterface::SetCodecPreferences(
     rtc::ArrayView<RtpCodecCapability>) {
-  RTC_NOTREACHED() << "Not implemented";
+  RTC_DCHECK_NOTREACHED() << "Not implemented";
   return {};
 }
 
@@ -78,7 +80,7 @@
 
 RTCError RtpTransceiverInterface::SetDirectionWithError(
     RtpTransceiverDirection new_direction) {
-  RTC_NOTREACHED() << "Default implementation called";
+  RTC_DCHECK_NOTREACHED() << "Default implementation called";
   return RTCError::OK();
 }