C#: Clean up unused.

Author: aschackmull

csharp/ql/lib/semmle/code/csharp/dataflow/internal/SsaImpl.qll

@@ -734,15 +734,15 @@ private predicate variableReadPseudo(ControlFlow::BasicBlock bb, int i, Ssa::Sou
 }
 
 pragma[noinline]
-private predicate adjacentDefRead(
+deprecated private predicate adjacentDefRead(
   Definition def, SsaInput::BasicBlock bb1, int i1, SsaInput::BasicBlock bb2, int i2,
   SsaInput::SourceVariable v
 ) {
   Impl::adjacentDefRead(def, bb1, i1, bb2, i2) and
   v = def.getSourceVariable()
 }
 
-private predicate adjacentDefReachesRead(
+deprecated private predicate adjacentDefReachesRead(
   Definition def, SsaInput::SourceVariable v, SsaInput::BasicBlock bb1, int i1,
   SsaInput::BasicBlock bb2, int i2
 ) {
@@ -760,18 +760,7 @@ private predicate adjacentDefReachesRead(
   )
 }
 
-/** Same as `adjacentDefRead`, but skips uncertain reads. */
-pragma[nomagic]
-private predicate adjacentDefSkipUncertainReads(
-  Definition def, SsaInput::BasicBlock bb1, int i1, SsaInput::BasicBlock bb2, int i2
-) {
-  exists(SsaInput::SourceVariable v |
-    adjacentDefReachesRead(def, v, bb1, i1, bb2, i2) and
-    SsaInput::variableRead(bb2, i2, v, true)
-  )
-}
-
-private predicate adjacentDefReachesUncertainRead(
+deprecated private predicate adjacentDefReachesUncertainRead(
   Definition def, SsaInput::BasicBlock bb1, int i1, SsaInput::BasicBlock bb2, int i2
 ) {
   exists(SsaInput::SourceVariable v |
@@ -956,17 +945,6 @@ private module Cached {
     )
   }
 
-  cached
-  predicate lastRefBeforeRedef(Definition def, ControlFlow::BasicBlock bb, int i, Definition next) {
-    Impl::lastRefRedef(def, bb, i, next) and
-    not SsaInput::variableRead(bb, i, def.getSourceVariable(), false)
-    or
-    exists(SsaInput::BasicBlock bb0, int i0 |
-      Impl::lastRefRedef(def, bb0, i0, next) and
-      adjacentDefReachesUncertainRead(def, bb, i, bb0, i0)
-    )
-  }
-
   cached
   Definition uncertainWriteDefinitionInput(UncertainWriteDefinition def) {
     Impl::uncertainWriteDefinitionInput(def, result)