IAR: Fix ASM compiler architecture detection

Narrow the regex to match the actual supported architectures,
avoiding mismatched detection.

Fixes: #24145

Modules/CMakeDetermineASMCompiler.cmake

@@ -129,14 +129,13 @@ if(NOT CMAKE_ASM${ASM_DIALECT}_COMPILER_ID)
   if("x${CMAKE_ASM${ASM_DIALECT}_COMPILER_ID}" STREQUAL "xIAR")
     # primary necessary to detect architecture, so the right archiver and linker can be picked
     # eg. "IAR Assembler V8.10.1.12857/W32 for ARM" or "IAR Assembler V4.11.1.4666 for Renesas RX"
-    # Cut out identification first, newline handling is a pain
+    # Earlier versions did not provide `--version`, so grep the full output to extract Assembler ID string
     string(REGEX MATCH "IAR Assembler[^\r\n]*" _compileid "${CMAKE_ASM${ASM_DIALECT}_COMPILER_ID_OUTPUT}")
     if("${_compileid}" MATCHES "V([0-9]+\\.[0-9]+\\.[0-9]+)")
       set(CMAKE_ASM${ASM_DIALECT}_COMPILER_VERSION ${CMAKE_MATCH_1})
     endif()
-    string(REGEX MATCHALL "([A-Za-z0-9-]+)" _all_compileid_matches "${_compileid}")
-    if(_all_compileid_matches)
-      list(GET _all_compileid_matches "-1" CMAKE_ASM${ASM_DIALECT}_COMPILER_ARCHITECTURE_ID)
+    if("${_compileid}" MATCHES "for.*(MSP430|8051|ARM|AVR|RH850|RISC-?V|RL78|RX|STM8|V850)")
+      set(CMAKE_ASM${ASM_DIALECT}_COMPILER_ARCHITECTURE_ID ${CMAKE_MATCH_1})
     endif()
   elseif("x${CMAKE_ASM${ASM_DIALECT}_COMPILER_ID}" STREQUAL "xClang")
     # Test whether an MSVC-like command-line option works.