[docs] Convert docs index page into Sphinx.

 - Work in progress, this is mostly important because it lets us incrementally migrate the remaining documentation.
 - Lots of styling, editing, and integration work yet to come…
 - PR12589

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155133 91177308-0d34-0410-b5e6-96231b3b80d8

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+.. _subsystems:
+
+Subsystem Documentation
+=======================
+
+ * `Writing an LLVM Pass <WritingAnLLVMPass.html>`_
+    
+    Information on how to write LLVM transformations and analyses.
+    
+ * `Writing an LLVM Backend <WritingAnLLVMBackend.html>`_
+    
+    Information on how to write LLVM backends for machine targets.
+    
+ * `The LLVM Target-Independent Code Generator <CodeGenerator.html>`_
+    
+    The design and implementation of the LLVM code generator.  Useful if you are
+    working on retargetting LLVM to a new architecture, designing a new codegen
+    pass, or enhancing existing components.
+    
+ * `TableGen Fundamentals <TableGenFundamentals.html>`_
+    
+    Describes the TableGen tool, which is used heavily by the LLVM code
+    generator.
+    
+ * `Alias Analysis in LLVM <AliasAnalysis.html>`_
+    
+    Information on how to write a new alias analysis implementation or how to
+    use existing analyses.
+    
+ * `Accurate Garbage Collection with LLVM <GarbageCollection.html>`_
+    
+    The interfaces source-language compilers should use for compiling GC'd
+    programs.
+    
+ * `Source Level Debugging with LLVM <SourceLevelDebugging.html>`_
+    
+    This document describes the design and philosophy behind the LLVM
+    source-level debugger.
+    
+ * `Zero Cost Exception handling in LLVM <ExceptionHandling.html>`_
+    
+    This document describes the design and implementation of exception handling
+    in LLVM.
+    
+ * `Bugpoint <Bugpoint.html>`_
+    
+    Automatic bug finder and test-case reducer description and usage
+    information.
+    
+ * `LLVM Bitcode File Format <BitCodeFormat.html>`_
+    
+    This describes the file format and encoding used for LLVM "bc" files.
+    
+ * `System Library <SystemLibrary.html>`_
+    
+    This document describes the LLVM System Library (<tt>lib/System</tt>) and
+    how to keep LLVM source code portable
+    
+ * `Link Time Optimization <LinkTimeOptimization.html>`_
+    
+    This document describes the interface between LLVM intermodular optimizer
+    and the linker and its design
+    
+ * `The LLVM gold plugin <GoldPlugin.html>`_
+    
+    How to build your programs with link-time optimization on Linux.
+    
+ * `The GDB JIT interface <DebuggingJITedCode.html>`_
+    
+    How to debug JITed code with GDB.
+    
+ * `Branch Weight Metadata <BranchWeightMetadata.html>`_
+    
+    Provides information about Branch Prediction Information.