Auto merge of rust-lang#131570 - ehuss:update-xcode, r=Mark-Simulacrum

(ci) Update macOS Xcode to 15

This updates the macOS builders to Xcode 15. The aarch64 images will be removing Xcode 14 and 16 very soon (actions/runner-images#10703), so we will need to make the switch to continue operating. The linked issue also documents GitHub's new policy for how they will be updating Xcode in the future. Also worth being aware of is the future plans for x86 runners documented in actions/runner-images#9255 and actions/runner-images#10686, which will impact our future upgrade behaviors.

I decided to also update the Xcode in the x86_64 runners, even though they are not being removed. It felt better to me to have all macOS runners on the same (major) version of Xcode. However, note that the x86_64 runners do not have the latest version of 15 (15.4), so I left them at 15.2 (which is currently the default Xcode of the runner).

Xcode 15 was previously causing problems (see rust-lang#121058) which seem to be resolved now. `@bjorn3` fixed the `invalid r_symbolnum` issue with cranelift. The issue with clang failing to link seems to be fixed, possibly by the update of the pre-built LLVM from 14 to llvm 15 in rust-lang#124850, or an update in our source version of LLVM. I have run some try builds and at least LLVM seems to build (I did not run any tests).

Closes rust-lang#121058

src/ci/github-actions/jobs.yml

@@ -46,7 +46,7 @@ envs:
     RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
     MACOSX_DEPLOYMENT_TARGET: 10.12
     MACOSX_STD_DEPLOYMENT_TARGET: 10.12
-    SELECT_XCODE: /Applications/Xcode_14.3.1.app
+    SELECT_XCODE: /Applications/Xcode_15.2.app
     NO_LLVM_ASSERTIONS: 1
     NO_DEBUG_ASSERTIONS: 1
     NO_OVERFLOW_CHECKS: 1
@@ -282,7 +282,7 @@ auto:
       RUST_CONFIGURE_ARGS: --enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set rust.lto=thin --set rust.codegen-units=1
       RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
       MACOSX_DEPLOYMENT_TARGET: 10.12
-      SELECT_XCODE: /Applications/Xcode_14.3.1.app
+      SELECT_XCODE: /Applications/Xcode_15.2.app
       NO_LLVM_ASSERTIONS: 1
       NO_DEBUG_ASSERTIONS: 1
       NO_OVERFLOW_CHECKS: 1
@@ -298,7 +298,7 @@ auto:
       RUST_CONFIGURE_ARGS: --enable-sanitizers --enable-profiler --set rust.jemalloc --set target.aarch64-apple-ios-macabi.sanitizers=false --set target.x86_64-apple-ios-macabi.sanitizers=false
       RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
       MACOSX_DEPLOYMENT_TARGET: 10.12
-      SELECT_XCODE: /Applications/Xcode_14.3.1.app
+      SELECT_XCODE: /Applications/Xcode_15.2.app
       NO_LLVM_ASSERTIONS: 1
       NO_DEBUG_ASSERTIONS: 1
       NO_OVERFLOW_CHECKS: 1
@@ -327,7 +327,7 @@ auto:
         --set llvm.ninja=false
         --set rust.lto=thin
       RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
-      SELECT_XCODE: /Applications/Xcode_14.3.1.app
+      SELECT_XCODE: /Applications/Xcode_15.4.app
       USE_XCODE_CLANG: 1
       MACOSX_DEPLOYMENT_TARGET: 11.0
       MACOSX_STD_DEPLOYMENT_TARGET: 11.0
@@ -347,7 +347,7 @@ auto:
         --enable-profiler
         --set rust.jemalloc
       RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
-      SELECT_XCODE: /Applications/Xcode_14.3.1.app
+      SELECT_XCODE: /Applications/Xcode_15.4.app
       USE_XCODE_CLANG: 1
       MACOSX_DEPLOYMENT_TARGET: 11.0
       MACOSX_STD_DEPLOYMENT_TARGET: 11.0