short-circuit the easy cases in is_copy_modulo_regions

This change is somewhat extensive, since it affects MIR -- since this is called to determine Copy vs Move -- so any test that's `no_core` needs to actually have the normal `impl`s it uses.

Author: scottmcm

compiler/rustc_middle/src/ty/util.rs

@@ -704,7 +704,7 @@ impl<'tcx> Ty<'tcx> {
         tcx_at: TyCtxtAt<'tcx>,
         param_env: ty::ParamEnv<'tcx>,
     ) -> bool {
-        tcx_at.is_copy_raw(param_env.and(self))
+        self.is_trivially_pure_clone_copy() || tcx_at.is_copy_raw(param_env.and(self))
     }
 
     /// Checks whether values of this type `T` have a size known at

src/test/assembly/sparc-struct-abi.rs

@@ -13,6 +13,7 @@
 pub trait Sized {}
 #[lang = "copy"]
 pub trait Copy {}
+impl Copy for f32 {}
 
 #[repr(C)]
 pub struct Franta {

src/test/assembly/target-feature-multiple.rs

@@ -23,6 +23,7 @@
 trait Sized {}
 #[lang = "copy"]
 trait Copy {}
+impl Copy for u32 {}
 
 // Use of these requires target features to be enabled
 extern "unadjusted" {

src/test/codegen/abi-sysv64.rs

@@ -13,6 +13,7 @@
 trait Sized {}
 #[lang = "copy"]
 trait Copy {}
+impl Copy for i64 {}
 
 // CHECK: define x86_64_sysvcc i64 @has_sysv64_abi
 #[no_mangle]

src/test/codegen/abi-x86-interrupt.rs

@@ -13,6 +13,7 @@
 trait Sized {}
 #[lang = "copy"]
 trait Copy {}
+impl Copy for i64 {}
 
 // CHECK: define x86_intrcc i64 @has_x86_interrupt_abi
 #[no_mangle]

src/test/codegen/frame-pointer.rs

@@ -17,7 +17,7 @@
 trait Sized { }
 #[lang="copy"]
 trait Copy { }
-
+impl Copy for u32 {}
 
 
 // CHECK: define i32 @peach{{.*}}[[PEACH_ATTRS:\#[0-9]+]] {

src/test/codegen/riscv-abi/riscv64-lp64-lp64f-lp64d-abi.rs

@@ -10,6 +10,14 @@
 trait Sized {}
 #[lang = "copy"]
 trait Copy {}
+impl Copy for bool {}
+impl Copy for i8 {}
+impl Copy for u8 {}
+impl Copy for i32 {}
+impl Copy for i64 {}
+impl Copy for u64 {}
+impl Copy for f32 {}
+impl Copy for f64 {}
 
 // CHECK: define void @f_void()
 #[no_mangle]

src/test/ui/cmse-nonsecure/cmse-nonsecure-call/params-on-registers.rs

@@ -7,6 +7,7 @@
 pub trait Sized { }
 #[lang="copy"]
 pub trait Copy { }
+impl Copy for u32 {}
 
 extern "rust-intrinsic" {
     pub fn transmute<T, U>(e: T) -> U;

src/test/ui/cmse-nonsecure/cmse-nonsecure-call/params-on-stack.rs

@@ -7,6 +7,7 @@
 pub trait Sized { }
 #[lang="copy"]
 pub trait Copy { }
+impl Copy for u32 {}
 
 extern "rust-intrinsic" {
     pub fn transmute<T, U>(e: T) -> U;

src/test/ui/cmse-nonsecure/cmse-nonsecure-entry/params-on-registers.rs

@@ -7,6 +7,7 @@
 trait Sized { }
 #[lang="copy"]
 trait Copy { }
+impl Copy for u32 {}
 
 #[no_mangle]
 #[cmse_nonsecure_entry]