gas: Use udata for DW_AT_high_pc when emitting DWARF4

For DWARF4 DW_AT_high_pc can be expressed as constant offset from
DW_AT_low_pc which saves a relocation. Use DW_FORM_udate (uleb128)
to keep the constant value as small as possible.

gas/ChangeLog:

       * dwarf2dbg.c (out_debug_abbrev): When DWARF2_VERSION >= 4, use
       DW_FORM_udata for DW_AT_high_pc.
       (out_debug_info): Use emit_leb128_expr for DW_AT_high_pc, when
       DWARF2_VERSION >= 4.
       * read.c (emit_leb128_exp): No longer static.
       * read.h (emit_leb128_exp): Define.

1 files changed, 1 insertions, 0 deletions

diff --git a/gas/read.h b/gas/read.h
index 502f3b6..ffcdbb6 100644
--- a/gas/read.h
+++ b/gas/read.h
@@ -132,6 +132,7 @@ extern void emit_expr_with_reloc (expressionS *exp, unsigned int nbytes,
 				  TC_PARSE_CONS_RETURN_TYPE);
 extern void emit_expr_fix (expressionS *, unsigned int, fragS *, char *,
 			   TC_PARSE_CONS_RETURN_TYPE);
+extern void emit_leb128_expr (expressionS *, int);
 extern void equals (char *, int);
 extern void float_cons (int);
 extern void ignore_rest_of_line (void);