nak: Drop some unused helpers

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24998>

src/nouveau/compiler/nak_ir.rs

@@ -1056,10 +1056,6 @@ impl Src {
         }
     }
 
-    pub fn get_reg(&self) -> Option<&RegRef> {
-        self.src_ref.get_reg()
-    }
-
     pub fn iter_ssa(&self) -> slice::Iter<'_, SSAValue> {
         self.src_ref.iter_ssa()
     }
@@ -1113,24 +1109,6 @@ impl Src {
         }
     }
 
-    pub fn is_false(&self) -> bool {
-        match self.src_ref {
-            SrcRef::True => self.src_mod.is_bnot(),
-            SrcRef::False => !self.src_mod.is_bnot(),
-            _ => false,
-        }
-    }
-
-    pub fn is_reg_or_zero(&self) -> bool {
-        match self.src_ref {
-            SrcRef::Zero | SrcRef::SSA(_) | SrcRef::Reg(_) => true,
-            SrcRef::True
-            | SrcRef::False
-            | SrcRef::Imm32(_)
-            | SrcRef::CBuf(_) => false,
-        }
-    }
-
     #[allow(dead_code)]
     pub fn supports_type(&self, src_type: &SrcType) -> bool {
         match src_type {

src/nouveau/compiler/nak_liveness.rs

@@ -32,10 +32,6 @@ impl LiveSet {
         self.live[file]
     }
 
-    pub fn counts(&self) -> &PerRegFile<u32> {
-        &self.live
-    }
-
     pub fn insert(&mut self, ssa: SSAValue) -> bool {
         if self.set.insert(ssa) {
             self.live[ssa.file()] += 1;