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/core/util/utils.h

@@ -54,9 +54,9 @@ typedef unsigned int uint;
 typedef uint64_t uint64;
 
 #if defined(__GNUC__)
-#include "mm_malloc.h"
 #if defined(__i386__) || defined(__x86_64__)
 #include <x86intrin.h>
+#elif defined(__aarch64__)
 #else
 #error \
     "Processor or compiler not identified.  " \
@@ -70,9 +70,9 @@ typedef uint64_t uint64;
 #define __ALIGNED__(x) __attribute__((aligned(x)))
 
 static __forceinline void* _aligned_malloc(size_t size, size_t alignment) {
-  return _mm_malloc(size, alignment);
+  return aligned_alloc(alignment, size);
 }
-static __forceinline void _aligned_free(void* ptr) { return _mm_free(ptr); }
+static __forceinline void _aligned_free(void* ptr) { return free(ptr); }
 #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
 #include "intrin.h"
 #define __ALIGNED__(x) __declspec(align(x))