[RFA] Fix inconsistency in blockvector addrmap vs non-addrmap handling

[dje@google.com (Doug Evans)]

Hi.

I was seeing the assert in dw2_find_pc_sect_psymtab trigger
and traced it to the fact that when pending_addrmap_interesting gets
set blockvector.map is used instead of blockvector.block.
The difference is that blockvector.block contains entries for the global
and static blocks whereas pending_addrmap doesn't.

This patch fixes this by making them consistent.
I suspect more work is necessary (e.g. can symtabs "overlap" even though
the individual pieces do not?).
But I first want to fix the regression introduced by the change
to dw2_find_pc_sect_psymtab: There is more code in a symtab than is
documented by function and lexical block pc ranges (e.g. C++ method thunks).

Regression tested on amd64-linux, and by verifying the assert no longer
triggers in the testcase I was using.

Ok to commit?

Note that this obviates the need for the patch in:
http://sourceware.org/ml/gdb-patches/2012-05/msg00958.html

Also note that this accompanies this patch:
http://sourceware.org/ml/gdb-patches/2012-06/msg00105.html

2012-06-04  Doug Evans  <dje@google.com>

	* buildsym.c (end_symtab): Add the range of the static block to
	the pending addrmap.

Index: buildsym.c
===================================================================
RCS file: /cvs/src/src/gdb/buildsym.c,v
retrieving revision 1.97
diff -u -p -r1.97 buildsym.c
--- buildsym.c	29 May 2012 20:23:17 -0000	1.97
+++ buildsym.c	5 Jun 2012 00:26:01 -0000
@@ -1024,8 +1027,15 @@ end_symtab (CORE_ADDR end_addr, struct o
     {
       /* Define the STATIC_BLOCK & GLOBAL_BLOCK, and build the
          blockvector.  */
-      finish_block (0, &file_symbols, 0, last_source_start_addr,
-		    end_addr, objfile);
+      struct block *static_block;
+
+      static_block = finish_block (0, &file_symbols, 0,
+				   last_source_start_addr, end_addr,
+				   objfile);
+      /* Mark the range of the static block so that if we end up using
+	 blockvector.map then find_block_in_blockvector behaves identically
+	 regardless of whether the addrmap is present.  */
+      record_block_range (static_block, last_source_start_addr, end_addr - 1);
       finish_block_internal (0, &global_symbols, 0, last_source_start_addr,
 			     end_addr, objfile, 1);
       blockvector = make_blockvector (objfile);