[m-rev.] diff: update the compiler design document

[Julien Fischer]

Update the compiler design document.

compiler/notes/compiler_design.html:
     Delete a reference to the GCC backend.

     Document the module used by the C# backend.

     Add a missing space in a spot.

diff --git a/compiler/notes/compiler_design.html b/compiler/notes/compiler_design.html
index a937feb..c1c496c 100644
--- a/compiler/notes/compiler_design.html
+++ b/compiler/notes/compiler_design.html
@@ -675,7 +675,7 @@ The HLDS data structure itself is spread over the following modules:
  <li>
      const_struct.m defines the part of the HLDS concerning constant structures.
  <li>
-    hlds_pred.m defines the part of the HLDSconcerning
+    hlds_pred.m defines the part of the HLDS concerning
      predicates and procedures;
  <li>
      pred_table.m defines the tables that index predicates and functions
@@ -2036,9 +2036,9 @@ Thus we have a pass which transforms the HLDS to handle trailing:
  <p>
  There are currently four backends that generate code from MLDS:
  one generates C/C++ code,
-one generates assembler (by interfacing with the GCC back-end),
  one generates Microsoft's Intermediate Language (MSIL or IL),
-and one generates Java.
+one generates Java,
+and one generates C#.

  <ul>
  <li>
@@ -2078,6 +2078,15 @@ The MLDS->Java backend is broken into two submodules.
  After the Java code has been emitted, a Java compiler (normally javac)
  is invoked to turn the .java file into a .class file containing Java bytecodes.

+<p>
+
+<ul>
+<li>mlds_to_cs.m converts MLDS to C# code.
+</ul>
+
+After the C# code has been emitted, a C# compiler is invoked to turn the .cs
+file into a .dll or .exe.
+
  <hr>
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