Revert of de-proc sk_float_rsqrt

src/opts/SkOpts_neon.cpp

Index: src/opts/SkOpts_neon.cpp
diff --git a/src/opts/SkOpts_neon.cpp b/src/opts/SkOpts_neon.cpp
index cf7a5c22457517452d8ce1c803e056da30609324..97af416f5d358be31a1d3d6f137f0a27debed9a8 100644
--- a/src/opts/SkOpts_neon.cpp
+++ b/src/opts/SkOpts_neon.cpp
@@ -12,6 +12,7 @@
 #include "SkBlitRow_opts.h"
 #include "SkBlurImageFilter_opts.h"
 #include "SkColorCubeFilter_opts.h"
+#include "SkFloatingPoint_opts.h"
 #include "SkMatrix_opts.h"
 #include "SkMorphologyImageFilter_opts.h"
 #include "SkSwizzler_opts.h"
@@ -21,6 +22,7 @@
 
 namespace SkOpts {
     void Init_neon() {
+        rsqrt           = sk_neon::rsqrt;
         memset16        = sk_neon::memset16;
         memset32        = sk_neon::memset32;
         create_xfermode = sk_neon::create_xfermode;