Add TARGET_CORTEX_M_BASELINE/MAINLINE labels

To make it easier to have Thumb-1 and Thumb-2 versions of assembly,
add labels corresponding to them. Naming mirrors that of ARMv8-M
variants, but "baseline" also covers ARMv6-M, so does not include
exclusive-access instructions, for example.

These two labels correspond to the "p" and "w" variants of the
ARM standard library.

Author: kjbracey

tools/targets/__init__.py

@@ -37,29 +37,24 @@
            "CUMULATIVE_ATTRIBUTES", "get_resolution_order"]
 
 CORE_LABELS = {
-    "Cortex-M0": ["M0", "CORTEX_M", "LIKE_CORTEX_M0", "CORTEX"],
-    "Cortex-M0+": ["M0P", "CORTEX_M", "LIKE_CORTEX_M0", "CORTEX"],
-    "Cortex-M1": ["M1", "CORTEX_M", "LIKE_CORTEX_M1", "CORTEX"],
-    "Cortex-M3": ["M3", "CORTEX_M", "LIKE_CORTEX_M3", "CORTEX"],
-    "Cortex-M4": ["M4", "CORTEX_M", "RTOS_M4_M7", "LIKE_CORTEX_M4", "CORTEX"],
-    "Cortex-M4F": ["M4", "CORTEX_M", "RTOS_M4_M7", "LIKE_CORTEX_M4", "CORTEX"],
-    "Cortex-M7": ["M7", "CORTEX_M", "RTOS_M4_M7", "LIKE_CORTEX_M7", "CORTEX"],
-    "Cortex-M7F": ["M7", "CORTEX_M", "RTOS_M4_M7", "LIKE_CORTEX_M7", "CORTEX"],
-    "Cortex-M7FD": ["M7", "CORTEX_M", "RTOS_M4_M7", "LIKE_CORTEX_M7",
-                    "CORTEX"],
+    "Cortex-M0": ["M0", "CORTEX_M", "CORTEX_M_BASELINE", "LIKE_CORTEX_M0", "CORTEX"],
+    "Cortex-M0+": ["M0P", "CORTEX_M", "CORTEX_M_BASELINE", "LIKE_CORTEX_M0", "CORTEX"],
+    "Cortex-M1": ["M1", "CORTEX_M", "CORTEX_M_BASELINE", "LIKE_CORTEX_M1", "CORTEX"],
+    "Cortex-M3": ["M3", "CORTEX_M", "CORTEX_M_MAINLINE", "LIKE_CORTEX_M3", "CORTEX"],
+    "Cortex-M4": ["M4", "CORTEX_M", "CORTEX_M_MAINLINE", "RTOS_M4_M7", "LIKE_CORTEX_M4", "CORTEX"],
+    "Cortex-M4F": ["M4", "CORTEX_M", "CORTEX_M_MAINLINE", "RTOS_M4_M7", "LIKE_CORTEX_M4", "CORTEX"],
+    "Cortex-M7": ["M7", "CORTEX_M", "CORTEX_M_MAINLINE", "RTOS_M4_M7", "LIKE_CORTEX_M7", "CORTEX"],
+    "Cortex-M7F": ["M7", "CORTEX_M", "CORTEX_M_MAINLINE", "RTOS_M4_M7", "LIKE_CORTEX_M7", "CORTEX"],
+    "Cortex-M7FD": ["M7", "CORTEX_M", "CORTEX_M_MAINLINE", "RTOS_M4_M7", "LIKE_CORTEX_M7", "CORTEX"],
     "Cortex-A9": ["A9", "CORTEX_A", "LIKE_CORTEX_A9", "CORTEX"],
-    "Cortex-M23": ["M23", "CORTEX_M", "LIKE_CORTEX_M23", "CORTEX"],
-    "Cortex-M23-NS": ["M23", "M23_NS", "CORTEX_M", "LIKE_CORTEX_M23",
-                      "CORTEX"],
-    "Cortex-M33": ["M33", "CORTEX_M", "LIKE_CORTEX_M33", "CORTEX"],
-    "Cortex-M33-NS": ["M33", "M33_NS", "CORTEX_M", "LIKE_CORTEX_M33",
-                      "CORTEX"],
-    "Cortex-M33F": ["M33", "CORTEX_M", "LIKE_CORTEX_M33", "CORTEX"],
-    "Cortex-M33F-NS": ["M33", "M33_NS", "CORTEX_M", "LIKE_CORTEX_M33",
-                       "CORTEX"],
-    "Cortex-M33FE": ["M33", "CORTEX_M", "LIKE_CORTEX_M33", "CORTEX"],
-    "Cortex-M33FE-NS": ["M33", "M33_NS", "CORTEX_M", "LIKE_CORTEX_M33",
-                        "CORTEX"]
+    "Cortex-M23": ["M23", "CORTEX_M", "CORTEX_M_BASELINE", "LIKE_CORTEX_M23", "CORTEX"],
+    "Cortex-M23-NS": ["M23", "M23_NS", "CORTEX_M_BASELINE", "CORTEX_M", "LIKE_CORTEX_M23", "CORTEX"],
+    "Cortex-M33": ["M33", "CORTEX_M", "CORTEX_M_MAINLINE", "LIKE_CORTEX_M33", "CORTEX"],
+    "Cortex-M33-NS": ["M33", "M33_NS", "CORTEX_M_MAINLINE", "CORTEX_M", "LIKE_CORTEX_M33", "CORTEX"],
+    "Cortex-M33F": ["M33", "CORTEX_M", "CORTEX_M_MAINLINE", "LIKE_CORTEX_M33", "CORTEX"],
+    "Cortex-M33F-NS": ["M33", "M33_NS", "CORTEX_M_MAINLINE", "CORTEX_M", "LIKE_CORTEX_M33", "CORTEX"],
+    "Cortex-M33FE": ["M33", "CORTEX_M", "CORTEX_M_MAINLINE", "LIKE_CORTEX_M33", "CORTEX"],
+    "Cortex-M33FE-NS": ["M33", "M33_NS", "CORTEX_M_MAINLINE", "CORTEX_M", "LIKE_CORTEX_M33", "CORTEX"]
 }
 
 CORE_ARCH = {