add dwarf defines used in cfi statements

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

libc/sysdeps/linux/common/sysdep.h

@@ -137,3 +137,22 @@
 # endif
 
 #endif /* __ASSEMBLER__ */
+
+/* Values used for encoding parameter of cfi_personality and cfi_lsda.  */
+#define DW_EH_PE_absptr		0x00
+#define DW_EH_PE_omit		0xff
+#define DW_EH_PE_uleb128	0x01
+#define DW_EH_PE_udata2		0x02
+#define DW_EH_PE_udata4		0x03
+#define DW_EH_PE_udata8		0x04
+#define DW_EH_PE_sleb128	0x09
+#define DW_EH_PE_sdata2		0x0a
+#define DW_EH_PE_sdata4		0x0b
+#define DW_EH_PE_sdata8		0x0c
+#define DW_EH_PE_signed		0x08
+#define DW_EH_PE_pcrel		0x10
+#define DW_EH_PE_textrel	0x20
+#define DW_EH_PE_datarel	0x30
+#define DW_EH_PE_funcrel	0x40
+#define DW_EH_PE_aligned	0x50
+#define DW_EH_PE_indirect	0x80