Move ISA definitions into cdsl.isa.

The cretonne package is now split into two: cdsl and base.

lib/cretonne/meta/isa/__init__.py

@@ -6,8 +6,8 @@ The :py:mod:`isa` package contains sub-packages for each target instruction set
 architecture supported by Cretonne.
 """
 from __future__ import absolute_import
+from cdsl.isa import TargetISA  # noqa
 from . import riscv
-from cretonne import TargetISA  # noqa
 
 
 def all_isas():

lib/cretonne/meta/isa/riscv/defs.py

@@ -4,7 +4,7 @@ RISC-V definitions.
 Commonly used definitions.
 """
 from __future__ import absolute_import
-from cretonne import TargetISA, CPUMode
+from cdsl.isa import TargetISA, CPUMode
 import base.instructions
 
 isa = TargetISA('riscv', [base.instructions.GROUP])

lib/cretonne/meta/isa/riscv/recipes.py

@@ -9,7 +9,7 @@ instruction formats described in the reference:
     Version 2.1
 """
 from __future__ import absolute_import
-from cretonne import EncRecipe
+from cdsl.isa import EncRecipe
 from cdsl.predicates import IsSignedInt
 from base.formats import Binary, BinaryImm