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/modules/audio_processing/audio_processing_impl.cc b/modules/audio_processing/audio_processing_impl.cc
index 169ffe4..8a3ddf5 100644
--- a/modules/audio_processing/audio_processing_impl.cc
+++ b/modules/audio_processing/audio_processing_impl.cc
@@ -61,7 +61,7 @@
       return true;
   }
 
-  RTC_NOTREACHED();
+  RTC_DCHECK_NOTREACHED();
   return false;
 }
 
@@ -97,7 +97,7 @@
       return rate;
     }
   }
-  RTC_NOTREACHED();
+  RTC_DCHECK_NOTREACHED();
   return uppermost_native_rate;
 }
 
@@ -702,12 +702,12 @@
       return enqueueing_successful;
     }
     case RuntimeSetting::Type::kNotSpecified:
-      RTC_NOTREACHED();
+      RTC_DCHECK_NOTREACHED();
       return true;
   }
   // The language allows the enum to have a non-enumerator
   // value. Check that this doesn't happen.
-  RTC_NOTREACHED();
+  RTC_DCHECK_NOTREACHED();
   return true;
 }
 
@@ -878,13 +878,13 @@
         break;
       }
       case RuntimeSetting::Type::kPlayoutAudioDeviceChange:
-        RTC_NOTREACHED();
+        RTC_DCHECK_NOTREACHED();
         break;
       case RuntimeSetting::Type::kCustomRenderProcessingRuntimeSetting:
-        RTC_NOTREACHED();
+        RTC_DCHECK_NOTREACHED();
         break;
       case RuntimeSetting::Type::kNotSpecified:
-        RTC_NOTREACHED();
+        RTC_DCHECK_NOTREACHED();
         break;
       case RuntimeSetting::Type::kCaptureOutputUsed:
         bool value;
@@ -928,7 +928,7 @@
       case RuntimeSetting::Type::kCaptureFixedPostGain:    // fall-through
       case RuntimeSetting::Type::kCaptureOutputUsed:       // fall-through
       case RuntimeSetting::Type::kNotSpecified:
-        RTC_NOTREACHED();
+        RTC_DCHECK_NOTREACHED();
         break;
     }
   }
@@ -1592,7 +1592,7 @@
     return true;
   }
   RTC_LOG(LS_ERROR) << "No linear AEC output available";
-  RTC_NOTREACHED();
+  RTC_DCHECK_NOTREACHED();
   return false;
 }