Updating the help message. Also enable -h and -help as per request in #2472.

Enables `-h` and `-help` for non-release builds, and `-?`, `-h`, and `-help` for release builds.

Messages will look as follows.

debug/test builds:

```
Usage: ch.exe [-v|-version] [-h|-help] [-?] [flaglist] <source file>
        -v|-version             Displays version info
        -h|-help                Displays this help message
        -?                      Displays this help message with complete [flaglist] info
```

release builds:

```
Usage: ch.exe [-v|-version] [-h|-help|-?] <source file>
Note: [flaglist] is not supported in Release builds; try a Debug or Test build to enable these flags.
        -v|-version             Displays version info
        -h|-help|-?             Displays this help message
```

The distinction is that `-?` is already implemented in debug/test builds to display full information about the `[flaglist]` options. This is a minimal change here that will result in guiding the user more accurately in all build flavors, the effect of which is that `-?` in debug/test builds is still the only way to get information about the `[flaglist]` options.

Author: dilijev

bin/ch/HostConfigFlags.cpp

@@ -78,7 +78,7 @@ void HostConfigFlags::PrintUsage()
         pfnPrintUsage();
     }
 
-    wprintf(_u("\nFlag List : \n"));
+    wprintf(_u("\nHost Config Flags: \n\n"));
     HostConfigFlags::PrintUsageString();
     ChakraRTInterface::PrintConfigFlagsUsageString();
 }

bin/ch/ch.cpp

@@ -65,17 +65,28 @@ int HostExceptionFilter(int exceptionCode, _EXCEPTION_POINTERS *ep)
 
 void __stdcall PrintUsageFormat()
 {
-    wprintf(_u("\nUsage: %s [flaglist] <source file>\n"), hostName);
+    wprintf(_u("\nUsage: %s [-v|-version] [-h|-help] [-?] [flaglist] <source file>\n"), hostName);
+    wprintf(_u("\t-v|-version\t\tDisplays version info\n"));
+    wprintf(_u("\t-h|-help\t\tDisplays this help message\n"));
+    wprintf(_u("\t-?\t\t\tDisplays this help message with complete [flaglist] info\n"));
 }
 
+#if !defined(ENABLE_DEBUG_CONFIG_OPTIONS)
+void __stdcall PrintReleaseUsage()
+{
+    wprintf(_u("\nUsage: %s [-v|-version] [-h|-help|-?] <source file> %s"), hostName,
+        _u("\nNote: [flaglist] is not supported in Release builds; try a Debug or Test build to enable these flags.\n"));
+    wprintf(_u("\t-v|-version\t\tDisplays version info\n"));
+    wprintf(_u("\t-h|-help|-?\t\tDisplays this help message\n"));
+}
+#endif
+
 void __stdcall PrintUsage()
 {
 #if !defined(ENABLE_DEBUG_CONFIG_OPTIONS)
-    wprintf(_u("\nUsage: %s <source file> %s"), hostName,
-            _u("\n[flaglist] is not supported for Release mode\n"));
+    PrintReleaseUsage();
 #else
     PrintUsageFormat();
-    wprintf(_u("Try '%s -?' for help\n"), hostName);
 #endif
 }
 
@@ -805,6 +816,18 @@ int _cdecl wmain(int argc, __in_ecount(argc) LPWSTR argv[])
             PAL_Shutdown();
             return EXIT_SUCCESS;
         }
+        else if (
+#if !defined(ENABLE_DEBUG_CONFIG_OPTIONS) // release builds can display some kind of help message
+            (arglen == 1 && wcsncmp(arg, _u("?"),    arglen) == 0) ||
+#endif
+            (arglen == 1 && wcsncmp(arg, _u("h"),    arglen) == 0) ||
+            (arglen == 4 && wcsncmp(arg, _u("help"), arglen) == 0)
+            )
+        {
+            PrintUsage();
+            PAL_Shutdown();
+            return EXIT_SUCCESS;
+        }
         else if(wcsstr(argv[i], _u("-TTRecord=")) == argv[i])
         {
             doTTRecord = true;