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[cc1] Fix valid_va_list

Directly comparing objects via pointers is too strict and the check
would fail for typedefs.

--- a/cc1/arch/amd64-sysv/arch.c

+++ b/cc1/arch/amd64-sysv/arch.c

@@ -218,5 +218,5 @@

 int

 valid_va_list(Type *tp)

 {

-	return tp->op == PTR && tp->type == va_type;

+	return tp->op == PTR && eqtype(tp->type, va_type, 1);

 }

--- a/cc1/arch/i386-sysv/arch.c

+++ b/cc1/arch/i386-sysv/arch.c

@@ -219,5 +219,5 @@

 int

 valid_va_list(Type *tp)

 {

-	return tp == va_list_type;

+	return eqtype(tp, va_list_type, 1);

 }

--- a/cc1/arch/qbe/arch.c

+++ b/cc1/arch/qbe/arch.c

@@ -218,5 +218,5 @@

 int

 valid_va_list(Type *tp)

 {

-	return tp->op == PTR && tp->type == va_type;

+	return tp->op == PTR && eqtype(tp->type, va_type, 1);

 }

--- a/cc1/arch/z80/arch.c

+++ b/cc1/arch/z80/arch.c

@@ -217,5 +217,5 @@

 int

 valid_va_list(Type *tp)

 {

-	return tp == va_list_type;

+	return eqtype(tp, va_list_type, 1);

 }