Rename langref.rst to ir.rst.

This aligns with our use of the term "IR" rather than "IL" or
other terms involving "language".

cranelift/docs/compare-llvm.rst

@@ -89,7 +89,7 @@ representation. Some target ISAs have a fast instruction selector that can
 translate simple code directly to MachineInstrs, bypassing SelectionDAG when
 possible.
 
-:doc:`Cranelift <langref>` uses a single intermediate representation to cover
+:doc:`Cranelift <ir>` uses a single intermediate representation to cover
 these levels of abstraction. This is possible in part because of Cranelift's
 smaller scope.
 

cranelift/docs/index.rst

@@ -6,8 +6,8 @@ Contents:
 .. toctree::
    :maxdepth: 1
 
-   langref
-   metaref
+   ir
+   meta
    testing
    regalloc
    compare-llvm

cranelift/docs/ir.rst

@@ -1,6 +1,6 @@
-****************************
-Cranelift Language Reference
-****************************
+**********************
+Cranelift IR Reference
+**********************
 
 .. default-domain:: clif
 .. highlight:: clif

cranelift/docs/meta.rst

@@ -80,7 +80,7 @@ open :class:`InstructionGroup`.
 .. autoclass:: InstructionGroup
     :members:
 
-The basic Cranelift instruction set described in :doc:`langref` is defined by the
+The basic Cranelift instruction set described in :doc:`ir` is defined by the
 Python module :mod:`base.instructions`. This module has a global value
 :data:`base.instructions.GROUP` which is an :class:`InstructionGroup` instance
 containing all the base instructions.

cranelift/docs/testing.rst

@@ -90,7 +90,7 @@ easier to provide substantial input functions for the compiler tests.
 File tests are :file:`*.clif` files in the :file:`filetests/` directory
 hierarchy. Each file has a header describing what to test followed by a number
 of input functions in the :doc:`Cranelift textual intermediate representation
-<langref>`:
+<ir>`:
 
 .. productionlist::
     test_file     : test_header `function_list`