[Docs] Removes Subsystem Documentation page

Removes Subsystem Documentation page. Also moves existing topics on Subsystem Documentation page to User Guides and Reference pages.

llvm-svn: 373872
diff --git a/llvm/docs/Reference.rst b/llvm/docs/Reference.rst
index 0e55be3..a24a8a1 100644
--- a/llvm/docs/Reference.rst
+++ b/llvm/docs/Reference.rst
@@ -10,23 +10,47 @@
    :hidden:

 

    Atomics

+   BitCodeFormat

+   BlockFrequencyTerminology

+   BranchWeightMetadata

    Bugpoint

+   CFIVerify

    CommandGuide/index

    CompilerWriterInfo

+   Coroutines

+   DependenceGraphs/index

+   ExceptionHandling

    Extensions

+   FaultMaps

    FuzzingLLVM

    GarbageCollection

    GetElementPtr

+   GlobalISel

    GwpAsan

    HowToSetUpLLVMStyleRTTI

+   HowToUseAttributes

+   InAlloca

    LangRef

    LibFuzzer

+   MarkedUpDisassembly

+   MemorySSA

    MIRLangRef

    OptBisect

+   ORCv2

    PDB/index

    ScudoHardenedAllocator

+   SegmentedStacks

+   StackMaps

+   SpeculativeLoadHardening

+   SupportLibrary

    Statepoints

+   SystemLibrary

    TestingGuide

+   TransformMetadata

+   TypeMetadata

+   XRay

+   XRayExample

+   XRayFDRFormat

    YamlIO

 

 API Reference

@@ -37,6 +61,10 @@
 

 `Documentation for Go bindings <http://godoc.org/llvm.org/llvm/bindings/go/llvm>`_

 

+:doc:`ORCv2`

+   Describes the design and implementation of the ORC APIs, including some

+   usage examples, and a guide for users transitioning from ORCv1 to ORCv2.

+

 LLVM Reference

 --------------

 

@@ -44,16 +72,32 @@
   Defines the LLVM intermediate representation and the assembly form of the

   different nodes.

 

+:doc:`FaultMaps`

+  LLVM support for folding control flow into faulting machine instructions.

+

+:doc:`InAlloca`

+  Description of the ``inalloca`` argument attribute.

+

 :doc:`Machine IR (MIR) Format Reference Manual <MIRLangRef>`

    A reference manual for the MIR serialization format, which is used to test

    LLVM's code generation passes.

 

+:doc:`GlobalISel`

+  This describes the prototype instruction selection replacement, GlobalISel.

+

 :doc:`Atomics`

   Information about LLVM's concurrency model.

 

+:doc:`ExceptionHandling`

+   This document describes the design and implementation of exception handling

+   in LLVM.

+

 :doc:`CompilerWriterInfo`

   A list of helpful links for compiler writers.

 

+:doc:`BitCodeFormat`

+   This describes the file format and encoding used for LLVM "bc" files.

+

 :doc:`Extensions`

   LLVM-specific extensions to tools and formats LLVM seeks compatibility with.

 

@@ -61,6 +105,20 @@
   How to make ``isa<>``, ``dyn_cast<>``, etc. available for clients of your

   class hierarchy.

 

+:doc:`BlockFrequencyTerminology`

+   Provides information about terminology used in the ``BlockFrequencyInfo``

+   analysis pass.

+

+:doc:`BranchWeightMetadata`

+   Provides information about Branch Prediction Information.

+

+:doc:`MemorySSA`

+   Information about the MemorySSA utility in LLVM, as well as how to use it.

+

+:doc:`Support Library <SupportLibrary>`

+   This document describes the LLVM Support Library (``lib/Support``) and

+   how to keep LLVM source code portable

+

 :doc:`GetElementPtr`

   Answers to some very frequent questions about LLVM's most frequently

   misunderstood instruction.

@@ -71,6 +129,32 @@
 :doc:`GwpAsan`

   A sampled heap memory error detection toolkit designed for production use.

 

+:doc:`Dependence Graphs <DependenceGraphs/index>`

+  A description of the design of the various dependence graphs such as

+  the DDG (Data Dependence Graph).

+

+:doc:`CFIVerify`

+  A description of the verification tool for Control Flow Integrity.

+

+:doc:`SpeculativeLoadHardening`

+  A description of the Speculative Load Hardening mitigation for Spectre v1.

+

+:doc:`SegmentedStacks`

+   This document describes segmented stacks and how they are used in LLVM.

+

+:doc:`MarkedUpDisassembly`

+   This document describes the optional rich disassembly output syntax.

+

+:doc:`HowToUseAttributes`

+  Answers some questions about the new Attributes infrastructure.

+

+:doc:`StackMaps`

+  LLVM support for mapping instruction addresses to the location of

+  values and allowing code to be patched.

+

+:doc:`Coroutines`

+  LLVM support for coroutines.

+

 :doc:`YamlIO`

    A reference guide for using LLVM's YAML I/O library.

 

@@ -122,4 +206,14 @@
    A reference manual for using the LLVM testing infrastructure.

 

 :doc:`TestSuiteGuide`

-  Describes how to compile and run the test-suite benchmarks.
\ No newline at end of file
+  Describes how to compile and run the test-suite benchmarks.

+

+====

+XRay

+====

+

+:doc:`XRay`

+  High-level documentation of how to use XRay in LLVM.

+

+:doc:`XRayExample`

+  An example of how to debug an application with XRay.
\ No newline at end of file