bench: refactor to use dynamic memory allocation in stats/strided/dnanmeanpw

PR-URL: #9770
Ref: #8643

Reviewed-by: Philipp Burckhardt <pburckhardt@outlook.com>
Signed-off-by: Vishal Gaikwad <154438441+ivishal-g@users.noreply.github.com>

Author: whizzel

lib/node_modules/@stdlib/stats/strided/dnanmeanpw/benchmark/c/benchmark.length.c

@@ -96,11 +96,12 @@ static double rand_double( void ) {
 */
 static double benchmark1( int iterations, int len ) {
 	double elapsed;
-	double x[ len ];
+	double *x;
 	double v;
 	double t;
 	int i;
 
+	x = (double *) malloc( len * sizeof( double ) );
 	for ( i = 0; i < len; i++ ) {
 		if ( rand_double() < 0.2 ) {
 			x[ i ] = 0.0 / 0.0; // NaN
@@ -122,6 +123,7 @@ static double benchmark1( int iterations, int len ) {
 	if ( v != v ) {
 		printf( "should not return NaN\n" );
 	}
+	free( x );
 	return elapsed;
 }
 
@@ -134,11 +136,12 @@ static double benchmark1( int iterations, int len ) {
 */
 static double benchmark2( int iterations, int len ) {
 	double elapsed;
-	double x[ len ];
+	double *x;
 	double v;
 	double t;
 	int i;
 
+	x = (double *) malloc( len * sizeof( double ) );
 	for ( i = 0; i < len; i++ ) {
 		if ( rand_double() < 0.2 ) {
 			x[ i ] = 0.0 / 0.0; // NaN
@@ -160,6 +163,7 @@ static double benchmark2( int iterations, int len ) {
 	if ( v != v ) {
 		printf( "should not return NaN\n" );
 	}
+	free( x );
 	return elapsed;
 }