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[cc1] Remove not used variables

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -786,7 +786,6 @@

 	static char file[FILENAME_MAX];

 	static unsigned nline;

 	char *s;

-	int i;

 	putchar('\n');

 	if (strcmp(file, filenam)) {

--- a/cc1/fold.c

+++ b/cc1/fold.c

@@ -503,8 +503,8 @@

 static Node *

 identity(Node *np)

 {

-	int iszeror, isoner, istruer;

-	int iszerol, isonel, istruel;

+	int iszeror, isoner;

+	int iszerol, isonel;

 	Node *lp = np->left, *rp = np->right;

 	if (!rp)

@@ -512,10 +512,8 @@

 	iszeror = cmpnode(rp, 0);

 	isoner = cmpnode(rp, 1),

-	istruer = !iszeror && rp->flags & NCONST;

 	iszerol = cmpnode(lp, 0);

-	isonel = cmpnode(lp, 1),

-	istruel = !iszerol && lp->flags & NCONST;

+	isonel = cmpnode(lp, 1);

 	switch (np->op) {

 	case OOR:

--- a/cc1/main.c

+++ b/cc1/main.c

@@ -44,7 +44,6 @@

 int

 main(int argc, char *argv[])

 {

-	char *cp;

 	int i;

 	ilex();