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/call/adaptation/video_stream_adapter.cc b/call/adaptation/video_stream_adapter.cc
index ca62502..c6560b3 100644
--- a/call/adaptation/video_stream_adapter.cc
+++ b/call/adaptation/video_stream_adapter.cc
@@ -509,7 +509,7 @@
     max_frame_rate = balanced_settings_.MinFps(input_state.video_codec_type(),
                                                frame_size_pixels);
   } else {
-    RTC_NOTREACHED();
+    RTC_DCHECK_NOTREACHED();
     max_frame_rate = GetLowerFrameRateThan(input_state.frames_per_second());
   }
   if (!CanDecreaseFrameRateTo(max_frame_rate,
@@ -584,7 +584,7 @@
       return Adaptation::Status::kLimitReached;
     }
   } else {
-    RTC_NOTREACHED();
+    RTC_DCHECK_NOTREACHED();
     max_frame_rate = GetHigherFrameRateThan(input_state.frames_per_second());
   }
   if (current_restrictions.counters.fps_adaptations == 1) {
diff --git a/call/rtp_config.cc b/call/rtp_config.cc
index c84a63e..5457a94 100644
--- a/call/rtp_config.cc
+++ b/call/rtp_config.cc
@@ -29,7 +29,7 @@
     if (ssrcs[i] == ssrc)
       return associated_ssrcs[i];
   }
-  RTC_NOTREACHED();
+  RTC_DCHECK_NOTREACHED();
   return 0;
 }
 
diff --git a/call/rtp_payload_params.cc b/call/rtp_payload_params.cc
index 53a4cca..5eff91f 100644
--- a/call/rtp_payload_params.cc
+++ b/call/rtp_payload_params.cc
@@ -295,7 +295,7 @@
     case VideoCodecType::kVideoCodecMultiplex:
       return;
   }
-  RTC_NOTREACHED() << "Unsupported codec.";
+  RTC_DCHECK_NOTREACHED() << "Unsupported codec.";
 }
 
 void RtpPayloadParams::GenericToGeneric(int64_t shared_frame_id,