Auto merge of #126332 - GuillaumeGomez:rollup-bu1q4pz, r=GuillaumeGomez

Rollup of 9 pull requests

Successful merges:

 - #126039 (Promote `arm64ec-pc-windows-msvc` to tier 2)
 - #126075 (Remove `DebugWithInfcx` machinery)
 - #126228 (Provide correct parent for nested anon const)
 - #126232 (interpret: dyn trait metadata check: equate traits in a proper way)
 - #126242 (Simplify provider api to improve llvm ir)
 - #126294 (coverage: Replace the old span refiner with a single function)
 - #126295 (No uninitalized report in a pre-returned match arm)
 - #126312 (Update `rustc-perf` submodule)
 - #126322 (Follow up to splitting core's PanicInfo and std's PanicInfo)

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 7 insertions, 6 deletions

diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index da97de1f716..c672cff7452 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -146,6 +146,7 @@ target | std | notes
 [`arm-linux-androideabi`](platform-support/android.md) | ✓ | Armv6 Android
 `arm-unknown-linux-musleabi` | ✓ | Armv6 Linux with musl 1.2.3
 `arm-unknown-linux-musleabihf` | ✓ | Armv6 Linux with musl 1.2.3, hardfloat
+[`arm64ec-pc-windows-msvc`](platform-support/arm64ec-pc-windows-msvc.md) | ✓ | Arm64EC Windows MSVC
 [`armebv7r-none-eabi`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian
 [`armebv7r-none-eabihf`](platform-support/armv7r-none-eabi.md) | * | Bare Armv7-R, Big Endian, hardfloat
 `armv5te-unknown-linux-gnueabi` | ✓ | Armv5TE Linux (kernel 4.4, glibc 2.23)
@@ -240,7 +241,6 @@ target | std | host | notes
 -------|:---:|:----:|-------
 [`arm64e-apple-ios`](platform-support/arm64e-apple-ios.md) | ✓ | | ARM64e Apple iOS
 [`arm64e-apple-darwin`](platform-support/arm64e-apple-darwin.md)  | ✓ | ✓ | ARM64e Apple Darwin
-[`arm64ec-pc-windows-msvc`](platform-support/arm64ec-pc-windows-msvc.md) | ? | | Arm64EC Windows MSVC
 [`aarch64-apple-ios-macabi`](platform-support/apple-ios-macabi.md) | ✓ |  | Apple Catalyst on ARM64
 [`aarch64-apple-tvos`](platform-support/apple-tvos.md) | ✓ |  | ARM64 tvOS
 [`aarch64-apple-tvos-sim`](platform-support/apple-tvos.md) | ✓ |  | ARM64 tvOS Simulator
diff --git a/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md b/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md
index 2e827535862..dcabd21a83e 100644
--- a/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md
+++ b/src/doc/rustc/src/platform-support/arm64ec-pc-windows-msvc.md
@@ -1,6 +1,6 @@
 # `arm64ec-pc-windows-msvc`
 
-**Tier: 3**
+**Tier: 2**
 
 Arm64EC ("Emulation Compatible") for mixed architecture (AArch64 and x86_64)
 applications on AArch64 Windows 11. See <https://learn.microsoft.com/en-us/windows/arm/arm64ec>.
@@ -21,6 +21,9 @@ Only supported backend is LLVM 18 or above:
 * 18.1.4 fixed linking issue for some intrinsics implemented in
   `compiler_builtins`.
 
+Visual Studio 2022 (or above) with the "ARM64/ARM64EC built tools" component and
+the Windows 11 SDK are required.
+
 ### Reusing code from other architectures - x86_64 or AArch64?
 
 Arm64EC uses `arm64ec` as its `target_arch`, but it is possible to reuse
@@ -62,10 +65,8 @@ target = [ "arm64ec-pc-windows-msvc" ]
 
 ## Building Rust programs
 
-Rust does not yet ship pre-compiled artifacts for this target. To compile for
-this target, you will either need to build Rust with the target enabled (see
-"Building the target" above), or build your own copy using `build-std` or
-similar.
+These targets are distributed through `rustup`, and otherwise require no
+special configuration.
 
 ## Testing