Promote aarch64-pc-windows-msvc to Tier 1

Author: dpaoliello

compiler/rustc_target/src/spec/targets/aarch64_pc_windows_msvc.rs

@@ -15,7 +15,7 @@ pub(crate) fn target() -> Target {
         llvm_target: "aarch64-pc-windows-msvc".into(),
         metadata: TargetMetadata {
             description: Some("ARM64 Windows MSVC".into()),
-            tier: Some(2),
+            tier: Some(1),
             host_tools: Some(true),
             std: Some(true),
         },

src/bootstrap/src/core/build_steps/llvm.rs

@@ -205,6 +205,7 @@ pub(crate) fn is_ci_llvm_available_for_target(
         // tier 1
         ("aarch64-unknown-linux-gnu", false),
         ("aarch64-apple-darwin", false),
+        ("aarch64-pc-windows-msvc", false),
         ("i686-pc-windows-gnu", false),
         ("i686-pc-windows-msvc", false),
         ("i686-unknown-linux-gnu", false),
@@ -213,7 +214,6 @@ pub(crate) fn is_ci_llvm_available_for_target(
         ("x86_64-pc-windows-gnu", true),
         ("x86_64-pc-windows-msvc", true),
         // tier 2 with host tools
-        ("aarch64-pc-windows-msvc", false),
         ("aarch64-unknown-linux-musl", false),
         ("arm-unknown-linux-gnueabi", false),
         ("arm-unknown-linux-gnueabihf", false),

src/doc/rustc/src/platform-support.md

@@ -33,6 +33,7 @@ All tier 1 targets with host tools support the full standard library.
 target | notes
 -------|-------
 [`aarch64-apple-darwin`](platform-support/apple-darwin.md) | ARM64 macOS (11.0+, Big Sur+)
+[`aarch64-pc-windows-msvc`](platform-support/windows-msvc.md) | ARM64 Windows MSVC
 `aarch64-unknown-linux-gnu` | ARM64 Linux (kernel 4.1+, glibc 2.17+)
 [`i686-pc-windows-msvc`](platform-support/windows-msvc.md) | 32-bit MSVC (Windows 10+, Windows Server 2016+, Pentium 4) [^x86_32-floats-return-ABI] [^win32-msvc-alignment]
 `i686-unknown-linux-gnu` | 32-bit Linux (kernel 3.2+, glibc 2.17+, Pentium 4) [^x86_32-floats-return-ABI]
@@ -88,7 +89,6 @@ so Rustup may install the documentation for a similar tier 1 target instead.
 target | notes
 -------|-------
 [`aarch64-pc-windows-gnullvm`](platform-support/windows-gnullvm.md) | ARM64 MinGW (Windows 10+), LLVM ABI
-[`aarch64-pc-windows-msvc`](platform-support/windows-msvc.md) | ARM64 Windows MSVC
 [`aarch64-unknown-linux-musl`](platform-support/aarch64-unknown-linux-musl.md) | ARM64 Linux with musl 1.2.3
 [`aarch64-unknown-linux-ohos`](platform-support/openharmony.md) | ARM64 OpenHarmony
 `arm-unknown-linux-gnueabi` | Armv6 Linux (kernel 3.2+, glibc 2.17)

src/doc/rustc/src/platform-support/windows-msvc.md

@@ -4,13 +4,10 @@ Windows MSVC targets.
 
 **Tier 1 with host tools:**
 
+- `aarch64-pc-windows-msvc`: Windows on ARM64.
 - `i686-pc-windows-msvc`: Windows on 32-bit x86.
 - `x86_64-pc-windows-msvc`: Windows on 64-bit x86.
 
-**Tier 2 with host tools:**
-
-- `aarch64-pc-windows-msvc`: Windows on ARM64.
-
 ## Target maintainers
 
 [@ChrisDenton](https://github.com/ChrisDenton)