Include assembly entry points in TAGS

[Peter Chubb <peterc@gelato.unsw.edu.au>]

As it stands, etags doesn't find labels in the IA64 or i386 assembler source
code, because they're disguised inside a preprocessor macro.

I propose the attached fix, which adds a regular expression to enable
labels disguised by ENTRY() and GLOBAL_ENTRY() macros.

There's a similar problem for MIPS, which needs to match LEAF(entrypoint)

Signed-off-by: Peter Chubb <peterc@gelato.unsw.edu.au>

diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -1187,7 +1187,7 @@ cscope: FORCE
 	$(call cmd,cscope)
 
 quiet_cmd_TAGS = MAKE   $@
-cmd_TAGS = $(all-sources) | etags -
+cmd_TAGS = $(all-sources) | etags --regex='{asm}/\(GLOBAL_\)?ENTRY(\([^)]+\))/\2/' -
 
 # 	Exuberant ctags works better with -I
 
-
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