Fix thread safety issue.

https://jira.devtools.intel.com/browse/CVS-96155

Signed-off-by: Yan, Xiping <xiping.yan@intel.com>

Author: xipingyan

src/cpu/x64/jit_brgemm_conv_utils.cpp

@@ -423,7 +423,7 @@ struct brg_blocking_t : public jit_brgemm_conv_conf_t {
     static constexpr int bcast_simd = 16;
 
     int sp, sp_block, nb_sp;
-    static int last_ic_block_size;
+    static thread_local int last_ic_block_size;
 
     void get_from_jcp(const jit_brgemm_conv_conf_t &jcp) { *this = jcp; }
     void save_to_jcp(jit_brgemm_conv_conf_t &jcp) const { jcp = *this; }
@@ -494,7 +494,7 @@ struct brg_blocking_t : public jit_brgemm_conv_conf_t {
 unsigned brg_blocking_t::L1;
 unsigned brg_blocking_t::L2;
 unsigned brg_blocking_t::L3;
-int brg_blocking_t::last_ic_block_size;
+thread_local int brg_blocking_t::last_ic_block_size;
 
 float brg_blocking_t::io_k(dim_t src, dim_t wei, dim_t dst, float n, float pk,
         bool is_broadcast, bool is_shared) const {