Armcompiler (#9840)

* Initial compiler support

* added arm.py

* Changed licence to Arm suggested header

* Changed licence to the same as clang.py
Main author of file is Nick Forrington <Nick.Forrington@arm.com>
Minor changes by Srinath Vadlamani <srinath.vadlamani@arm.com>

* compilers: add arm compiler detection to Spack

- added arm.py with support for detecting `armclang` and `armflang`

Co-authored-by: Srinath Vadlamani <srinath.vadlamani@arm.com>

* Changed to using get get_compiler_version

* linking to general cc for arm compiler

* For arm compiler add CFLAGS to use compiler-rt rtlib.

* Escape for special characters in rexep

* Cleaned up for Flake8 to pass.

* libcompiler-rt should be part of the LDFLAGS not CFLAGS

* fixed m4 when using clang to used LDFLAGS.  Fixed comments for arm.py to display compiler --version output with # NOAQ for flakes pass.

* added arm compilers

* proper linked names

lib/spack/env/arm/armclang

@@ -0,0 +1 @@
+../cc

lib/spack/env/arm/armclang++

@@ -0,0 +1 @@
+../cc

lib/spack/env/arm/armflang

@@ -0,0 +1 @@
+../cc

lib/spack/env/cc

@@ -106,19 +106,19 @@ case "$command" in
     cpp)
         mode=cpp
         ;;
-    cc|c89|c99|gcc|clang|icc|pgcc|xlc|xlc_r)
+    cc|c89|c99|gcc|clang|armclang|icc|pgcc|xlc|xlc_r)
         command="$SPACK_CC"
         language="C"
         comp="CC"
         lang_flags=C
         ;;
-    c++|CC|g++|clang++|icpc|pgc++|xlc++|xlc++_r)
+    c++|CC|g++|clang++|armclang++|icpc|pgc++|xlc++|xlc++_r)
         command="$SPACK_CXX"
         language="C++"
         comp="CXX"
         lang_flags=CXX
         ;;
-    ftn|f90|fc|f95|gfortran|flang|ifort|pgfortran|xlf90|xlf90_r|nagfor)
+    ftn|f90|fc|f95|gfortran|flang|armflang|ifort|pgfortran|xlf90|xlf90_r|nagfor)
         command="$SPACK_FC"
         language="Fortran 90"
         comp="FC"