Add /debug:portable and /deterministic to csc/help and vbc/help

src/Compilers/CSharp/Portable/CSharpResources.resx

@@ -4390,10 +4390,13 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
 
                         - CODE GENERATION -
  /debug[+|-]                   Emit debugging information
- /debug:{full|pdbonly}         Specify debugging type ('full' is default, and 
+ /debug:{full|pdbonly|portable}
+                               Specify debugging type ('full' is default, and 
                                enables attaching a debugger to a running 
-                               program)
+                               program. 'portable' is a cross-platform format)
  /optimize[+|-]                Enable optimizations (Short form: /o)
+ /deterministic                Produce a deterministic assembly
+                               (module version GUID and timestamp)
 
                         - ERRORS AND WARNINGS -
  /warnaserror[+|-]             Report all warnings as errors

src/Compilers/VisualBasic/Portable/VBResources.resx

@@ -5048,7 +5048,10 @@
 /removeintchecks[+|-]             Remove integer checks. Default off.
 /debug[+|-]                       Emit debugging information.
 /debug:full                       Emit full debugging information (default).
+/debug:portable                   Emit debugging information in the portable format.
 /debug:pdbonly                    Emit PDB file only.
+/deterministic                    Produce a deterministic assembly
+                                  (module version GUID and timestamp)
 
                                   - ERRORS AND WARNINGS -
 /nowarn                           Disable all warnings.