Rollup merge of rust-lang#146034 - taiki-e:target-spec, r=nnethercote

Update target spec metadata of Arm64EC Windows and Trusty targets

Update outdated target spec metadata in the following targets.

- Arm64EC Windows (`arm64ec-pc-windows-msvc`) is "tier 2 without host tools" since rust-lang#126039 and supports `std`  since before that, but metadata currently says that is tier 3 and has unknown `std` support status.
- Trusty targets (`{aarch64,armv7,x86_64}-unknown-trusty`) support `std` since rust-lang#136842 (and I confirmed they can be compiled with `-Zbuild-std=std`), but metadata currently says that has no `std` support.

Mentioning `@dpaoliello` as [arm64ec-pc-windows-msvc target-maintainer](https://doc.rust-lang.org/nightly/rustc/platform-support/arm64ec-pc-windows-msvc.html#target-maintainers).
Mentioning `@randomPoison` `@ahomescu` as [Trusty target maintainers](https://doc.rust-lang.org/nightly/rustc/platform-support/trusty.html#target-maintainers).

Author: GuillaumeGomez

compiler/rustc_target/src/spec/targets/aarch64_unknown_trusty.rs

@@ -11,7 +11,7 @@ pub(crate) fn target() -> Target {
             description: Some("ARM64 Trusty".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: Some(true),
         },
         pointer_width: 64,
         data_layout: "e-m:e-p270:32:32-p271:32:32-p272:64:64-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128-Fn32".into(),

compiler/rustc_target/src/spec/targets/arm64ec_pc_windows_msvc.rs

@@ -20,9 +20,9 @@ pub(crate) fn target() -> Target {
         llvm_target: "arm64ec-pc-windows-msvc".into(),
         metadata: TargetMetadata {
             description: Some("Arm64EC Windows MSVC".into()),
-            tier: Some(3),
+            tier: Some(2),
             host_tools: Some(false),
-            std: None, // ?
+            std: Some(true),
         },
         pointer_width: 64,
         data_layout:

compiler/rustc_target/src/spec/targets/armv7_unknown_trusty.rs

@@ -13,7 +13,7 @@ pub(crate) fn target() -> Target {
             description: Some("Armv7-A Trusty".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: Some(true),
         },
         pointer_width: 32,
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),

compiler/rustc_target/src/spec/targets/x86_64_unknown_trusty.rs

@@ -12,7 +12,7 @@ pub(crate) fn target() -> Target {
             description: Some("x86_64 Trusty".into()),
             tier: Some(3),
             host_tools: Some(false),
-            std: Some(false),
+            std: Some(true),
         },
         pointer_width: 64,
         data_layout: