rename the crash reporter off its Chromium origins

Nothing Chromium-derived is left in either file - the stack tracer that
came from base/debug_util was the last of it - so the copyright header
credited Google for code it did not write and pointed at a LICENSE file
this repository does not have. Rename to what the files actually are.

While in there: say what the exception code's customer bit does and does
not guarantee, and note next to it how to stop a debugger breaking on
every assertion, which is what someone will be looking for when they grep
that number.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

sgp/CMakeLists.txt

@@ -5,7 +5,7 @@ set(sgpSrc
 "${CMAKE_CURRENT_SOURCE_DIR}/crash_telemetry.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/Cursor Control.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/DEBUG.cpp"
-"${CMAKE_CURRENT_SOURCE_DIR}/debug_win_util.cpp"
+"${CMAKE_CURRENT_SOURCE_DIR}/crash_report.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/DirectDraw Calls.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/DirectX Common.cpp"
 "${CMAKE_CURRENT_SOURCE_DIR}/English.cpp"

sgp/DEBUG.cpp

@@ -47,7 +47,7 @@
 #include "GameVersion.h"
 #include "Text.h"
 
-#include "debug_util.h"
+#include "crash_report.h"
 
 BOOLEAN gfRecordToFile     = FALSE;
 BOOLEAN gfRecordToDebugger = TRUE;

sgp/crash_report.cpp

@@ -1,12 +1,6 @@
-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-
-
 #if defined(_MSC_VER)
 
-#include "debug_util.h"
+#include "crash_report.h"
 
 #include <windows.h>
 

sgp/crash_report.h

@@ -1,18 +1,18 @@
-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
 // Crash reporting: capture a fault (or an assertion) as a report file, and hand
 // the pending reports to the telemetry uploader at startup.
 
-#ifndef BASE_DEBUG_UTIL_H_
-#define BASE_DEBUG_UTIL_H_
+#ifndef SGP_CRASH_REPORT_H_
+#define SGP_CRASH_REPORT_H_
 
 struct _EXCEPTION_POINTERS;
 
 // Assertion failures raise this software exception so they get the same crash
-// report as a real fault. Bit 29 set marks it customer-defined, so it can never
-// collide with a system code; the top two bits mark it an error.
+// report as a real fault. Bit 29 set marks it customer-defined, which keeps it out
+// of the system's own codes; the top two bits mark it an error. Other user-mode
+// producers set that bit too (MSVC's C++ exception is 0xE06D7363), so it is the
+// whole value that makes this code ours, not the bit alone.
+// A debugger sees this first-chance on every assert; `sxi e1a55e27` in WinDbg
+// (Debug > Exceptions in Visual Studio) stops it breaking.
 #define SGP_EXCEPTION_ASSERT 0xE1A55E27
 
 namespace sgp
@@ -49,4 +49,4 @@ namespace sgp
 	void processCrashTelemetry(const wchar_t* url);
 }
 
-#endif  // BASE_DEBUG_UTIL_H_
+#endif  // SGP_CRASH_REPORT_H_

sgp/crash_telemetry.cpp

@@ -1,14 +1,14 @@
 // Crash telemetry: upload the crash_report_*.txt files the crash handler left
 // behind, on the next launch.
 //
-// Deliberately a separate translation unit from debug_win_util.cpp. Everything in
+// Deliberately a separate translation unit from crash_report.cpp. Everything in
 // there runs inside a faulting thread and may not allocate; everything here runs at
 // startup with a healthy heap and is ordinary code. Keeping the two apart keeps the
 // no-heap rule easy to see and easy to hold.
 
 #if defined(_MSC_VER)
 
-#include "debug_util.h"
+#include "crash_report.h"
 
 #include <windows.h>
 #include <winhttp.h>

sgp/sgp.cpp

@@ -629,7 +629,7 @@ static vfs::String getGameID()
 	return _id;
 }
 
-#include "debug_util.h"
+#include "crash_report.h"
 #include "GameVersion.h" // czVersionString, stamped into crash reports
 #include <vfs/Aspects/vfs_logging.h>