rustc_abi: remove Primitive::{is_float,is_int}

there were fixmes for this already

i am about to remove is_ptr (since callers need to properly distinguish
between pointers in different address spaces), so might as well do this
at the same time

compiler/rustc_abi/src/lib.rs

@@ -887,18 +887,6 @@ impl Primitive {
         }
     }
 
-    // FIXME(eddyb) remove, it's trivial thanks to `matches!`.
-    #[inline]
-    pub fn is_float(self) -> bool {
-        matches!(self, F32 | F64)
-    }
-
-    // FIXME(eddyb) remove, it's completely unused.
-    #[inline]
-    pub fn is_int(self) -> bool {
-        matches!(self, Int(..))
-    }
-
     #[inline]
     pub fn is_ptr(self) -> bool {
         matches!(self, Pointer)

compiler/rustc_target/src/abi/call/sparc64.rs

@@ -20,7 +20,7 @@ where
 {
     let dl = cx.data_layout();
 
-    if !scalar.primitive().is_float() {
+    if !matches!(scalar.primitive(), abi::F32 | abi::F64) {
         return data;
     }
 
@@ -87,7 +87,7 @@ where
         _ => {}
     }
 
-    if (offset.bytes() % 4) != 0 && scalar2.primitive().is_float() {
+    if (offset.bytes() % 4) != 0 && matches!(scalar2.primitive(), abi::F32 | abi::F64) {
         offset += Size::from_bytes(4 - (offset.bytes() % 4));
     }
     data = arg_scalar(cx, scalar2, offset, data);

compiler/rustc_target/src/abi/mod.rs

@@ -129,7 +129,7 @@ impl<'a, Ty> TyAndLayout<'a, Ty> {
         C: HasDataLayout,
     {
         match self.abi {
-            Abi::Scalar(scalar) => scalar.primitive().is_float(),
+            Abi::Scalar(scalar) => matches!(scalar.primitive(), F32 | F64),
             Abi::Aggregate { .. } => {
                 if self.fields.count() == 1 && self.fields.offset(0).bytes() == 0 {
                     self.field(cx, 0).is_single_fp_element(cx)