Allow toString capability to be toggled independent of developer mode

src/opts/SkXfermode_opts_arm_neon.cpp

 #include "SkXfermode.h"
 #include "SkXfermode_proccoeff.h"
 #include "SkColorPriv.h"
 
 #include <arm_neon.h>
 #include "SkColor_opts_neon.h"
 #include "SkXfermode_opts_arm_neon.h"
 
 #define SkAlphaMulAlpha(a, b)   SkMulDiv255Round(a, b)
 
@@ skipping 817 matching lines @@
                 SkPMColor C = proc(src[i], dstC);
                 if (0xFF != a) {
                     C = SkFourByteInterp_neon(C, dstC, a);
                 }
                 dst[i] = SkPixel32ToPixel16_ToU16(C);
             }
         }
     }
 }
 
-#ifdef SK_DEVELOPER
+#ifndef SK_IGNORE_TO_STRING
 void SkNEONProcCoeffXfermode::toString(SkString* str) const {
     this->INHERITED::toString(str);
 }
 #endif
 
 ////////////////////////////////////////////////////////////////////////////////
 
 SkXfermodeProcSIMD gNEONXfermodeProcs[] = {
     NULL, // kClear_Mode
     NULL, // kSrc_Mode
@@ skipping 79 matching lines @@
 
     if (procSIMD != NULL) {
         return SkNEW_ARGS(SkNEONProcCoeffXfermode, (rec, mode, procSIMD));
     }
     return NULL;
 }
 
 SkXfermodeProc SkPlatformXfermodeProcFactory_impl_neon(SkXfermode::Mode mode) {
     return gNEONXfermodeProcs1[mode];
 }