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Add comdat support.

	Start of work for deduping symbols.

--- a/6/asm.h

+++ b/6/asm.h

@@ -74,6 +74,7 @@

 	size_t align;

 	char *lbl;  /* may be null */

 	char isglobl;

+	char iscomdat;

 	union {

 		uint64_t npad;

 		uint64_t ival;

--- a/6/gengas.c

+++ b/6/gengas.c

@@ -304,6 +304,8 @@

 	if (!b)

 		return;

 	if (b->lbl) {

+		if (b->iscomdat)

+			fprintf(fd, ".section .text.%s%s,\"axG\",%s%s,comdat\n", Symprefix, b->lbl, Symprefix, b->lbl);

 		if (b->isglobl)

 			fprintf(fd, ".globl %s%s\n", Symprefix, b->lbl);

 		fprintf(fd, "%s%s:\n", Symprefix, b->lbl);

@@ -356,6 +358,7 @@

 	ty->isemitted = 1;

 	b = tydescblob(ty);

+	b->iscomdat = 1;

 	writeblob(fd, b);

 	blobfree(b);

 }