add cx16.r0r1sl, cx16.r2r3sl, ... that memory-map signed longs on the virtual registers

docs/source/programming.rst

@@ -1155,6 +1155,7 @@ so pay attention to any jumps and rts instructions in the inlined code!
 
     - ``cx16.r0`` - ``cx16.r15``    (memory-mapped **uword** values, most often these are used)
     - ``cx16.r0s`` - ``cx16.r15s``  (memory-mapped **word** values, used when you need a signed word)
+    - ``cx16.r0r1sl`` - ``cx16.r14r15sl``  (memory-mapped **long** values in 2 consecutive virtual registers, used when you need a signed long)
     - ``cx16.r0H``, ``cx16.r0L``     (for each r0..r15; memory-mapped **ubyte** values, both bytes of the register)
     - ``cx16.r0sH``, ``cx16.r0sL``   (for each r0..r15; memory-mapped **byte** values, both bytes of the register)
     - ``cx16.r0bH``, ``cx16.r0bL``   (for each r0..r15; memory-mapped **bool** values, both bytes of the register)

docs/source/todo.rst

@@ -1,6 +1,7 @@
 TODO
 ====
 
+Implement struct field long bitshifts.  See github issue 194
 
 
 Weird Heisenbug
@@ -12,8 +13,7 @@ Weird Heisenbug
 Future Things and Ideas
 ^^^^^^^^^^^^^^^^^^^^^^^
 - make $8000000 a valid long integer (-2147483648) this is more involved than you think.  To make this work: long \|= $80000000
-- add cx16.r0r1sL, r2r3sL, ... etc to map signed longs on the virtual registers?
-- implement rest of long comparisons in IfElseAsmGen compareLongValues(): expressions operands that might clobber the R14-R15 registers...
+- implement rest of long comparisons in IfElseAsmGen compareLongValues(): expressions operands that might clobber the R14-R15 registers... (github issue 196?)
 - struct/ptr: implement the remaining TODOs in PointerAssignmentsGen.
 - struct/ptr: optimize deref in PointerAssignmentsGen: optimize 'forceTemporary' to only use a temporary when the offset is >0
 - struct/ptr: optimize the float copying in assignIndexedPointer() (also word and long?)