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Print the function name when debug dumping RA

--- a/6/asm.h

+++ b/6/asm.h

@@ -163,6 +163,8 @@

 /* instruction selection state */

 struct Isel {

+	char *name;

+

 	Cfg  *cfg;          /* cfg built with nodes */

 	Asmbb **bb;         /* 1:1 mappings with the Node bbs in the CFG */

--- a/6/gengas.c

+++ b/6/gengas.c

@@ -349,6 +349,7 @@

 	Isel is = {0,};

 	is.reglocs = mkht(varhash, vareq);

+	is.name = fn->name;

 	is.stkoff = fn->stkoff;

 	is.envoff = fn->envoff;

 	is.globls = globls;

--- a/6/genp9.c

+++ b/6/genp9.c

@@ -368,6 +368,7 @@

 	Isel is = {0,};

 	is.reglocs = mkht(varhash, vareq);

+	is.name = fn->name;

 	is.stkoff = fn->stkoff;

 	is.envoff = fn->envoff;

 	is.globls = globls;

--- a/6/ra.c

+++ b/6/ra.c

@@ -1431,6 +1431,7 @@

 	char *sep;

 	Asmbb *bb;

+	fprintf(fd, "function %s\n", s->name);

 	fprintf(fd, "WORKLISTS -- \n");

 	wlprint(stdout, "spill", s->wlspill, s->nwlspill);

 	wlprint(stdout, "simp", s->wlsimp, s->nwlsimp);