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Split out printing basic blocks in writeasm()

    It's easier to call the function from the debugger this way.

--- a/6/isel.c

+++ b/6/isel.c

@@ -819,19 +819,25 @@

     g(s, Iret, NULL);

 }

+static void writebb(FILE *fd, Asmbb *bb)

+{

+    size_t i;

+

+    for (i = 0; i < bb->nlbls; i++)

+        fprintf(fd, "%s:\n", bb->lbls[i]);

+    for (i = 0; i < bb->ni; i++)

+        iprintf(fd, bb->il[i]);

+}

+

 static void writeasm(FILE *fd, Isel *s, Func *fn)

 {

-    size_t i, j;

+    size_t i;

     if (fn->isexport || !strcmp(fn->name, Symprefix "main"))

         fprintf(fd, ".globl %s\n", fn->name);

     fprintf(fd, "%s:\n", fn->name);

-    for (j = 0; j < s->cfg->nbb; j++) {

-        for (i = 0; i < s->bb[j]->nlbls; i++)

-            fprintf(fd, "%s:\n", s->bb[j]->lbls[i]);

-        for (i = 0; i < s->bb[j]->ni; i++)

-            iprintf(fd, s->bb[j]->il[i]);

-    }

+    for (i = 0; i < s->nbb; i++)

+        writebb(fd, s->bb[i]);

 }

 static Asmbb *mkasmbb(Bb *bb)

@@ -959,6 +965,7 @@

     epilogue(&is);

     regalloc(&is);

+    peep(&is);

     if (debugopt['i'])

         writeasm(stdout, &is, fn);

     writeasm(fd, &is, fn);