Add -pathmap compiler option

docs/fsharp/language-reference/compiler-options.md

@@ -42,6 +42,7 @@ The following table shows compiler options listed alphabetically. Some of the F#
 |`--nowarn:warning-number-list`|Disables specific warnings listed by number. Separate each warning number by a comma. You can discover the warning number for any warning from the compilation output.<br /><br />This compiler option is equivalent to the C# compiler option of the same name. For more information, see [&#47;nowarn &#40;C&#35; Compiler Options&#41;](https://msdn.microsoft.com/library/7f28x9z3.aspx).|
 |<code>--optimize[+&#124;-][optimization-option-list]</code><br /><br /><code>-O[+&#124;-] [optimization-option-list]</code>|Enables or disables optimizations. Some optimization options can be disabled or enabled selectively by listing them. These are: `nojitoptimize`, `nojittracking`, `nolocaloptimize`, `nocrossoptimize`, `notailcalls`.|
 |`--out:output-filename`<br /><br />`-o:output-filename`|Specifies the name of the compiled assembly or module.<br /><br />This compiler option is equivalent to the C# compiler option of the same name. For more information, see [&#47;out &#40;C&#35; Compiler Options&#41;](https://msdn.microsoft.com/library/bw3t50f3.aspx).|
+|`--pathmap:path=sourcePath,...`|Specifies how to map physical paths to source path names output by the compiler.<br /><br />This compiler option is equivalent to the C# compiler option of the same name. For more information, see [&#47;pathmap &#40;C&#35; Compiler Options&#41;](/csharp/language-reference/compiler-options/pathmap-compiler-option).|
 |`--pdb:pdb-filename`|Names the output debug PDB (program database) file. This option only applies when `--debug` is also enabled.<br /><br />This compiler option is equivalent to the C# compiler option of the same name. For more information, see [&#47;pdb &#40;C&#35; Compiler Options&#41;](https://msdn.microsoft.com/library/ms228625.aspx).|
 |`--platform:platform-name`|Specifies that the generated code will only run on the specified platform (`x86`, `Itanium`, or `x64`), or, if the platform-name `anycpu` is chosen, specifies that the generated code can run on any platform.<br /><br />This compiler option is equivalent to the C# compiler option of the same name. For more information, see [&#47;platform &#40;C&#35; Compiler Options&#41;](https://msdn.microsoft.com/library/zekwfyz4.aspx).|
 |`--preferreduilang:lang`| Specifies the preferred output language culture name (for example,  `es-ES`, `ja-JP`). |