add compiletest for debuginfo generation for SVE predicates <vscale x N x i1> where N != 16

Author: h3fang

tests/ui/scalable-vectors/debuginfo-does-not-spill.rs

@@ -0,0 +1,39 @@
+// Compiletest for rust-lang/rust#150419: Do not spill operands to the stack when
+// creating debuginfo for AArch64 SVE predicates `<vscale x N x i1>` where `N != 16`
+//@ edition: 2021
+//@ only-aarch64
+//@ build-pass
+//@ compile-flags: -C debuginfo=2 -C target-feature=+sve
+
+#![crate_type = "lib"]
+#![allow(internal_features)]
+#![feature(rustc_attrs, link_llvm_intrinsics)]
+
+#[rustc_scalable_vector(16)]
+#[allow(non_camel_case_types)]
+#[repr(transparent)]
+pub struct svbool_t(bool);
+
+#[rustc_scalable_vector(4)]
+#[allow(non_camel_case_types)]
+#[repr(transparent)]
+pub struct svbool4_t(bool);
+
+impl std::convert::Into<svbool_t> for svbool4_t {
+    #[inline(always)]
+    fn into(self) -> svbool_t {
+        unsafe extern "C" {
+            #[link_name = "llvm.aarch64.sve.convert.to.svbool.nxv4i1"]
+            fn convert_to_svbool(b: svbool4_t) -> svbool_t;
+        }
+        unsafe { convert_to_svbool(self) }
+    }
+}
+
+pub fn svwhilelt_b32_u64(op1: u64, op2: u64) -> svbool_t {
+    unsafe extern "C" {
+        #[link_name = "llvm.aarch64.sve.whilelo.nxv4i1.u64"]
+        fn _svwhilelt_b32_u64(op1: u64, op2: u64) -> svbool4_t;
+    }
+    unsafe { _svwhilelt_b32_u64(op1, op2) }.into()
+}