[compiler-rt] Don't explicitly ad-hoc code sign dylibs if using Apple's new linker (#88323)

Apple's new linker reports itself as ld rather than ld64 and does not
match the version detection regex.

Invert the logic to look only for older versions of ld64. This ensures
the runtime dylibs are left with a linker-generated code signature that
tools such as `strip` will preserve.

Co-authored-by: Mark Rowe <[email protected]>

Author: bdash

compiler-rt/cmake/Modules/AddCompilerRT.cmake

@@ -405,11 +405,14 @@ function(add_compiler_rt_runtime name type)
         if (HAD_ERROR)
           message(FATAL_ERROR "${CMAKE_LINKER} failed with status ${HAD_ERROR}")
         endif()
-        set(NEED_EXPLICIT_ADHOC_CODESIGN 1)
+        set(NEED_EXPLICIT_ADHOC_CODESIGN 0)
+        # Apple introduced a new linker by default in Xcode 15. This linker reports itself as ld
+        # rather than ld64 and does not match this version regex. That's ok since it never needs
+        # the explicit ad-hoc code signature.
         if ("${LD_V_OUTPUT}" MATCHES ".*ld64-([0-9.]+).*")
           string(REGEX REPLACE ".*ld64-([0-9.]+).*" "\\1" HOST_LINK_VERSION ${LD_V_OUTPUT})
-          if (HOST_LINK_VERSION VERSION_GREATER_EQUAL 609)
-            set(NEED_EXPLICIT_ADHOC_CODESIGN 0)
+          if (HOST_LINK_VERSION VERSION_LESS 609)
+            set(NEED_EXPLICIT_ADHOC_CODESIGN 1)
           endif()
         endif()
         if (NEED_EXPLICIT_ADHOC_CODESIGN)