Revert "SSA destruction uses new SSA liveness checking"

This reverts commit 98c7de8410.

basis/compiler/cfg/ssa/destruction/destruction.factor

@@ -8,7 +8,7 @@ compiler.cfg.def-use
 compiler.cfg.renaming
 compiler.cfg.dominance
 compiler.cfg.instructions
-compiler.cfg.ssa.liveness
+compiler.cfg.liveness.ssa
 compiler.cfg.ssa.cssa
 compiler.cfg.ssa.interference
 compiler.cfg.ssa.interference.live-ranges
@@ -97,11 +97,11 @@ M: insn prepare-insn drop ;
 : destruct-ssa ( cfg -- cfg' )
     dup cfg-has-phis? [
         dup construct-cssa
-        dup precompute-liveness
+        compute-ssa-live-sets
         dup compute-defs
         dup compute-dominance
         dup compute-live-ranges
         dup prepare-coalescing
         process-copies
         dup perform-renaming
-    ] when ;
+    ] when ;

basis/compiler/cfg/ssa/interference/interference-tests.factor

@@ -1,6 +1,6 @@
 USING: accessors compiler.cfg compiler.cfg.debugger
 compiler.cfg.def-use compiler.cfg.dominance
-compiler.cfg.instructions compiler.cfg.ssa.liveness
+compiler.cfg.instructions compiler.cfg.liveness.ssa
 compiler.cfg.registers compiler.cfg.predecessors
 compiler.cfg.ssa.interference
 compiler.cfg.ssa.interference.live-ranges cpu.architecture
@@ -9,8 +9,8 @@ IN: compiler.cfg.ssa.interference.tests
 
 : test-interference ( -- )
     cfg new 0 get >>entry
+    compute-ssa-live-sets
     compute-predecessors
-    dup precompute-liveness
     dup compute-defs
     dup compute-dominance
     compute-live-ranges ;
@@ -49,4 +49,4 @@ V{
 [ t ] [ V int-regs 3 V int-regs 5 vregs-interfere? ] unit-test
 [ t ] [ V int-regs 5 V int-regs 3 vregs-interfere? ] unit-test
 [ f ] [ V int-regs 3 V int-regs 6 vregs-interfere? ] unit-test
-[ f ] [ V int-regs 6 V int-regs 3 vregs-interfere? ] unit-test
+[ f ] [ V int-regs 6 V int-regs 3 vregs-interfere? ] unit-test

basis/compiler/cfg/ssa/interference/live-ranges/live-ranges.factor

@@ -2,7 +2,7 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors assocs fry kernel namespaces sequences math
 arrays compiler.cfg.def-use compiler.cfg.instructions
-compiler.cfg.ssa.liveness compiler.cfg.rpo ;
+compiler.cfg.liveness.ssa compiler.cfg.rpo ;
 IN: compiler.cfg.ssa.interference.live-ranges
 
 ! Live ranges for interference testing