Add support for ARM

- Build system fixes
- No user-mode high-precision timer by default, use clock_gettime
- Use C11 aligned_alloc pending C++17 std::aligned_alloc

Change-Id: I268365bdfd11d1e817a89584b9e086ee5b86e1dc

runtime/hsa-runtime-tools/CMakeLists.txt

@@ -76,9 +76,9 @@ set ( CMAKE_CXX_FLAGS "-std=c++11 ")
 
 set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=return-type -Werror -fexceptions -fno-rtti -fvisibility=hidden -Wno-error=sign-compare -Wno-error=enum-compare -Wno-sign-compare -Wno-write-strings -Wno-deprecated-declarations -Wno-conversion-null -fno-math-errno -fno-threadsafe-statics -fmerge-all-constants -fms-extensions -Wno-error=comment -Wno-comment -Wno-error=pointer-arith -Wno-pointer-arith -fPIC" )
 
-if (IS64BIT)
+if ( CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" )
     set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64  -msse -msse2" )
-else ()
+elseif ( CMAKE_SYSTEM_PROCESSOR STREQUAL "x86" )
     set ( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32" )
 endif ()