Avoid memcpy inline expansion in gcc.dg/out-of-bounds-1.c

This avoids inline expansion to preserve the warning by making
the memcpy size a non-power-of-two as suggested by Martin Sebor.

2021-09-29  Richard Biener  <rguenther@suse.de>

	* gcc.dg/out-of-bounds-1.c: Make memcpied size not power-of-two.

gcc/testsuite/gcc.dg/out-of-bounds-1.c

@@ -8,6 +8,6 @@
 void ProjectOverlay(const float localTextureAxis[2], char *lump)
 {
    const void *d = &localTextureAxis;
-   int size = sizeof(float)*8 ;
+   int size = sizeof(float)*7 ;
    __builtin_memcpy( &lump[ 0 ], d, size );  /* { dg-warning "reading" } */
 }