Revert of de-proc sk_float_rsqrt

src/core/SkOpts.cpp

Index: src/core/SkOpts.cpp
diff --git a/src/core/SkOpts.cpp b/src/core/SkOpts.cpp
index 92e973c1d496671ba0f86ca8dbe84955e4390f66..c078d8590d0888c80a6babd5760d20fb88d867b8 100644
--- a/src/core/SkOpts.cpp
+++ b/src/core/SkOpts.cpp
@@ -13,6 +13,7 @@
 #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"
@@ -54,6 +55,7 @@
     // If our global compile options are set high enough, these defaults might even be
     // CPU-specialized, e.g. a typical x86-64 machine might start with SSE2 defaults.
     // They'll still get a chance to be replaced with even better ones, e.g. using SSE4.1.
+    decltype(rsqrt)                     rsqrt = sk_default::rsqrt;
     decltype(memset16)               memset16 = sk_default::memset16;
     decltype(memset32)               memset32 = sk_default::memset32;
     decltype(create_xfermode) create_xfermode = sk_default::create_xfermode;