Add bfloat16 based dot and conversion with single/double

1. Added bfloat16 based dot as new API: shdot
2. Implemented generic kernel and cooperlake-specific (AVX512-BF16) kernel for shdot
3. Added 4 conversion APIs for bfloat16 data type <=> single/double: shstobf16 shdtobf16 sbf16tos dbf16tod
     shstobf16 -- convert single float array to bfloat16 array
     shdtobf16 -- convert double float array to bfloat16 array
     sbf16tos  -- convert bfloat16 array to single float array
     dbf16tod  -- convert bfloat16 array to double float array
4. Implemented generic kernels for all 4 conversion APIs, and cooperlake-specific kernel for shstobf16 and shdtobf16
5. Update level1 thread facilitate functions and macros to support multi-threading for these new APIs
6. Fix Cooperlake platform detection/specify issue when under dynamic-arch building
7. Change the typedef of bfloat16 from unsigned short to more strict uint16_t

Signed-off-by: Chen, Guobing <guobing.chen@intel.com>

common_x86_64.h

@@ -142,6 +142,29 @@ static __inline void cpuid(int op, int *eax, int *ebx, int *ecx, int *edx){
 #endif
 }
 
+static __inline void cpuid_count(int op, int count, int *eax, int *ebx, int *ecx, int *edx)
+{
+#ifdef C_MSVC
+  int cpuInfo[4] = {-1};
+  __cpuidex(cpuInfo, op, count);
+  *eax = cpuInfo[0];
+  *ebx = cpuInfo[1];
+  *ecx = cpuInfo[2];
+  *edx = cpuInfo[3];
+#else
+#if defined(__i386__) && defined(__PIC__)
+  __asm__ __volatile__
+    ("mov %%ebx, %%edi;"
+      "cpuid;"
+      "xchgl %%ebx, %%edi;"
+      : "=a" (*eax), "=D" (*ebx), "=c" (*ecx), "=d" (*edx) : "0" (op), "2" (count) : "cc");
+#else
+  __asm__ __volatile__
+    ("cpuid": "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx) : "0" (op), "2" (count) : "cc");
+#endif
+#endif
+}
+
 /*
 #define WHEREAMI
 */