[compiler-rt] Add hexagon architecture to cmake (#98650)

Add hexagon to detect_target_arch, test_target macros.

Author: androm3da

compiler-rt/cmake/Modules/CompilerRTUtils.cmake

@@ -152,6 +152,7 @@ macro(detect_target_arch)
   check_symbol_exists(__aarch64__ "" __AARCH64)
   check_symbol_exists(__x86_64__ "" __X86_64)
   check_symbol_exists(__i386__ "" __I386)
+  check_symbol_exists(__hexagon__ "" __HEXAGON)
   check_symbol_exists(__loongarch__ "" __LOONGARCH)
   check_symbol_exists(__mips__ "" __MIPS)
   check_symbol_exists(__mips64__ "" __MIPS64)
@@ -182,6 +183,8 @@ macro(detect_target_arch)
     else()
       message(FATAL_ERROR "Unsupported pointer size for X86_64")
     endif()
+  elseif(__HEXAGON)
+    add_default_target_arch(hexagon)
   elseif(__I386)
     add_default_target_arch(i386)
   elseif(__LOONGARCH)

compiler-rt/cmake/base-config-ix.cmake

@@ -218,6 +218,8 @@ macro(test_targets)
       test_target_arch(amdgcn "" "--target=amdgcn-amd-amdhsa" "-nogpulib"
                        "-flto" "-fconvergent-functions"
                        "-Xclang -mcode-object-version=none")
+    elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "hexagon")
+      test_target_arch(hexagon "" "")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "loongarch64")
       test_target_arch(loongarch64 "" "")
     elseif("${COMPILER_RT_DEFAULT_TARGET_ARCH}" MATCHES "powerpc64le|ppc64le")