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cc2/qbe: Use unsigned char for asm codes

asm codes can go over 127, and it means that depending
in the ABI they can suffer sign extension that can
generate problems.

--- a/src/cmd/cc/cc2/target/qbe/cgen.c

+++ b/src/cmd/cc/cc2/target/qbe/cgen.c

@@ -7,7 +7,7 @@

 #include "arch.h"

 #include "../../cc2.h"

-static char opasmw[][2] = {

+static unsigned char opasmw[][2] = {

 	[OADD] = {ASADDW, ASADDW},

 	[OSUB] = {ASSUBW, ASSUBW},

 	[OMUL] = {ASMULW, ASMULW},

@@ -26,7 +26,7 @@

 	[OBXOR] = {ASBXORW, ASBXORW},

 };

-static char opasml[][2] = {

+static unsigned char opasml[][2] = {

 	[OADD] = {ASADDL, ASADDL},

 	[OSUB] = {ASSUBL, ASSUBL},

 	[OMUL] = {ASMULL, ASMULL},

@@ -45,7 +45,7 @@

 	[OBXOR] = {ASBXORL, ASBXORL},

 };

-static char opasms[][2] = {

+static unsigned char opasms[][2] = {

 	[OADD] = {ASADDS, ASADDS},

 	[OSUB] = {ASSUBS, ASSUBS},

 	[OMUL] = {ASMULS, ASMULS},

@@ -58,7 +58,7 @@

 	[ONE] = {ASNES, ASNES},

 };

-static char opasmd[][2] = {

+static unsigned char opasmd[][2] = {

 	[OADD] = {ASADDD, ASADDD},

 	[OSUB] = {ASSUBD, ASSUBD},

 	[OMUL] = {ASMULD, ASMULD},

@@ -71,7 +71,7 @@

 	[ONE] = {ASNED, ASNED},

 };

-static char (*opbin[][2])[2] = {

+static unsigned char (*opbin[][2])[2] = {

 	{opasmw, opasml},

 	{opasms, opasmd},

 };