Implement Sk2f::Store4

Bug: skia:
Change-Id: I2adb983d68625d327e7c00e53b6ae4703b46252f
Reviewed-on: https://skia-review.googlesource.com/104761
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/tests/SkNxTest.cpp b/tests/SkNxTest.cpp
index 349ffb6..9e2c27e 100644
--- a/tests/SkNxTest.cpp
+++ b/tests/SkNxTest.cpp
@@ -437,3 +437,20 @@
     REPORTER_ASSERT(r, dst[4] == 4);
     REPORTER_ASSERT(r, dst[5] == 5);
 }
+
+DEF_TEST(Sk2f_Store4, r) {
+    Sk2f p0{0, 4};
+    Sk2f p1{1, 5};
+    Sk2f p2{2, 6};
+    Sk2f p3{3, 7};
+    float dst[8];
+    Sk2f::Store4(dst, p0, p1, p2, p3);
+    REPORTER_ASSERT(r, dst[0] == 0);
+    REPORTER_ASSERT(r, dst[1] == 1);
+    REPORTER_ASSERT(r, dst[2] == 2);
+    REPORTER_ASSERT(r, dst[3] == 3);
+    REPORTER_ASSERT(r, dst[4] == 4);
+    REPORTER_ASSERT(r, dst[5] == 5);
+    REPORTER_ASSERT(r, dst[6] == 6);
+    REPORTER_ASSERT(r, dst[7] == 7);
+}