[compiler-rt] Simplify toplevel arm/thumb checks

[mstorsjo]

Summary

Mapping of arm*hf to armhf is done in construct_compiler_rt_default_triple
now after D98173 (making it available for builds that target
compiler-rt/lib/builtins directly, too). Do the check for thumb for any arm
target, not only armhf.

[phosek]

LGTM

[mstorsjo]

The bit of D98173 that this relies on was reverted, so this does't make sense as such now.

compiler-rt/CMakeLists.txt

if (COMPILER_RT_STANDALONE_BUILD)
   if (MSVC OR XCODE)
     set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
   endif()
   set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
   set(LLVM_LIT_OUTPUT_DIR "${COMPILER_RT_EXEC_OUTPUT_DIR}")
 endif()
 
 construct_compiler_rt_default_triple()
-if ("${COMPILER_RT_DEFAULT_TARGET_TRIPLE}" MATCHES ".*hf$")
-  if (${COMPILER_RT_DEFAULT_TARGET_ARCH} MATCHES "^arm")
-    set(COMPILER_RT_DEFAULT_TARGET_ARCH "armhf")
-    CHECK_SYMBOL_EXISTS (__thumb__ "" COMPILER_RT_ARM_THUMB)
-  endif()
-endif()
 if ("${COMPILER_RT_DEFAULT_TARGET_TRIPLE}" MATCHES ".*android.*")
   set(ANDROID 1)
   string(REGEX MATCH "-target(=| +)[^ ]+android[a-z]*([0-9]+)" ANDROID_API_LEVEL "${CMAKE_C_FLAGS}")
   set(ANDROID_API_LEVEL ${CMAKE_MATCH_2})
 endif()
 pythonize_bool(ANDROID)
 
 set(COMPILER_RT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})