Merge branch 'feature/toolchain_2020r1-RC1' into 'master'

Toolchain 2020r1 support bringing (esp32, esp32s2)

See merge request espressif/esp-idf!7509

components/soc/include/soc/spinlock.h

@@ -22,6 +22,12 @@
 #include "xtensa/xtruntime.h"
 
 
+#ifdef CONFIG_SPIRAM_WORKAROUND_NEED_VOLATILE_SPINLOCK
+#define NEED_VOLATILE_MUX volatile
+#else
+#define NEED_VOLATILE_MUX
+#endif
+
 #define SPINLOCK_FREE          0xB33FFFFF
 #define SPINLOCK_WAIT_FOREVER  (-1)  
 #define SPINLOCK_NO_WAIT        0  
@@ -29,8 +35,8 @@
 #define CORE_ID_REGVAL_XOR_SWAP (0xCDCD ^ 0xABAB)
 
 typedef struct {
-    uint32_t owner;
-    uint32_t count;
+    NEED_VOLATILE_MUX uint32_t owner;
+    NEED_VOLATILE_MUX uint32_t count;
 }spinlock_t;
 
 /**