PR26457 UBSAN: som.c:1794 left shift cannot be represented

[Alan Modra]

	PR 26457
	* som/aout.h (SOM_SUBSPACE_ACCESS_CONTROL_BITS_MASK): Make unsigned.
	(SOM_SUBSPACE_MEMORY_RESIDENT, SOM_SUBSPACE_DUP_COMMON)
	(SOM_SUBSPACE_IS_COMMON, SOM_SUBSPACE_IS_LOADABLE)
	(SOM_SUBSPACE_QUADRANT_MASK, SOM_SUBSPACE_INITIALLY_FROZEN)
	(SOM_SUBSPACE_IS_FIRST, SOM_SUBSPACE_CODE_ONLY)
	(SOM_SUBSPACE_SORT_KEY_MASK, SOM_SUBSPACE_REPLICATE_INIT)
	(SOM_SUBSPACE_CONTINUATION, SOM_SUBSPACE_IS_TSPECIFIC)
	(SOM_SUBSPACE_IS_COMDAT): Likewise.

diff --git a/include/som/aout.h b/include/som/aout.h
index 01b301fe01..e3675cced7 100644
--- a/include/som/aout.h
+++ b/include/som/aout.h
@@ -157,22 +157,22 @@ struct som_external_subspace_dictionary_record
 };
 
 #define SOM_SUBSPACE_ACCESS_CONTROL_BITS_SH	25
-#define SOM_SUBSPACE_ACCESS_CONTROL_BITS_MASK	0x7f
-#define SOM_SUBSPACE_MEMORY_RESIDENT		(1 << 24)
-#define SOM_SUBSPACE_DUP_COMMON			(1 << 23)
-#define SOM_SUBSPACE_IS_COMMON			(1 << 22)
-#define SOM_SUBSPACE_IS_LOADABLE		(1 << 21)
+#define SOM_SUBSPACE_ACCESS_CONTROL_BITS_MASK	0x7fU
+#define SOM_SUBSPACE_MEMORY_RESIDENT		(1U << 24)
+#define SOM_SUBSPACE_DUP_COMMON			(1U << 23)
+#define SOM_SUBSPACE_IS_COMMON			(1U << 22)
+#define SOM_SUBSPACE_IS_LOADABLE		(1U << 21)
 #define SOM_SUBSPACE_QUADRANT_SH		19
-#define SOM_SUBSPACE_QUADRANT_MASK		0x3
-#define SOM_SUBSPACE_INITIALLY_FROZEN		(1 << 18)
-#define SOM_SUBSPACE_IS_FIRST			(1 << 17)
-#define SOM_SUBSPACE_CODE_ONLY			(1 << 16)
+#define SOM_SUBSPACE_QUADRANT_MASK		0x3U
+#define SOM_SUBSPACE_INITIALLY_FROZEN		(1U << 18)
+#define SOM_SUBSPACE_IS_FIRST			(1U << 17)
+#define SOM_SUBSPACE_CODE_ONLY			(1U << 16)
 #define SOM_SUBSPACE_SORT_KEY_SH		8
-#define SOM_SUBSPACE_SORT_KEY_MASK		0xff
-#define SOM_SUBSPACE_REPLICATE_INIT		(1 << 7)
-#define SOM_SUBSPACE_CONTINUATION		(1 << 6)
-#define SOM_SUBSPACE_IS_TSPECIFIC		(1 << 5)
-#define SOM_SUBSPACE_IS_COMDAT			(1 << 4)
+#define SOM_SUBSPACE_SORT_KEY_MASK		0xffU
+#define SOM_SUBSPACE_REPLICATE_INIT		(1U << 7)
+#define SOM_SUBSPACE_CONTINUATION		(1U << 6)
+#define SOM_SUBSPACE_IS_TSPECIFIC		(1U << 5)
+#define SOM_SUBSPACE_IS_COMDAT			(1U << 4)
 
 struct som_external_compilation_unit
 {