Allow negative error for Sk4f::sqrt() test.

tests/Sk4xTest.cpp

 #include "Test.h"
 #include "Sk4x.h"
 
 #define ASSERT_EQ(a, b) REPORTER_ASSERT(r, a.equal(b).allTrue())
 #define ASSERT_NE(a, b) REPORTER_ASSERT(r, a.notEqual(b).allTrue())
 
 DEF_TEST(Sk4x_Construction, r) {
     Sk4f uninitialized;
     Sk4f zero(0,0,0,0);
     Sk4f foo(1,2,3,4),
@@ skipping 75 matching lines @@
 
 DEF_TEST(Sk4x_ExplicitPromotion, r) {
     ASSERT_EQ(Sk4f(2,4,6,8), Sk4f(1,2,3,4) * Sk4f(2.0f));
 }
 
 DEF_TEST(Sk4x_Sqrt, r) {
     Sk4f squares(4, 16, 25, 121),
            roots(2,  4,  5,  11);
     // .sqrt() should be pretty precise.
     Sk4f error = roots.subtract(squares.sqrt());
-    REPORTER_ASSERT(r, error.greaterThanEqual(Sk4f(0.0f)).allTrue());
-    REPORTER_ASSERT(r, error.lessThan(Sk4f(0.000001f)).allTrue());
+    REPORTER_ASSERT(r, (error > Sk4f(-0.000001f)).allTrue());
+    REPORTER_ASSERT(r, (error < Sk4f(+0.000001f)).allTrue());
 
     // .rsqrt() isn't so precise (for SSE), but should be pretty close.
     error = roots.subtract(squares.multiply(squares.rsqrt()));
-    REPORTER_ASSERT(r, error.greaterThanEqual(Sk4f(0.0f)).allTrue());
-    REPORTER_ASSERT(r, error.lessThan(Sk4f(0.01f)).allTrue());
+    REPORTER_ASSERT(r, (error > Sk4f(-0.01f)).allTrue());
+    REPORTER_ASSERT(r, (error < Sk4f(+0.01f)).allTrue());
 }
 
 DEF_TEST(Sk4x_Comparison, r) {
     ASSERT_EQ(Sk4f(1,2,3,4), Sk4f(1,2,3,4));
     ASSERT_NE(Sk4f(4,3,2,1), Sk4f(1,2,3,4));
 
     ASSERT_EQ(Sk4i(-1,-1,0,-1), Sk4f(1,2,5,4) == Sk4f(1,2,3,4));
 
     ASSERT_EQ(Sk4i(-1,-1,-1,-1), Sk4f(1,2,3,4) <  Sk4f(2,3,4,5));
     ASSERT_EQ(Sk4i(-1,-1,-1,-1), Sk4f(1,2,3,4) <= Sk4f(2,3,4,5));
@@ skipping 19 matching lines @@
 }
 
 DEF_TEST(Sk4x_Swizzle, r) {
     ASSERT_EQ(Sk4f(3,4,1,2), Sk4f(1,2,3,4).zwxy());
     ASSERT_EQ(Sk4f(1,2,5,6), Sk4f::XYAB(Sk4f(1,2,3,4), Sk4f(5,6,7,8)));
     ASSERT_EQ(Sk4f(3,4,7,8), Sk4f::ZWCD(Sk4f(1,2,3,4), Sk4f(5,6,7,8)));
     ASSERT_EQ(Sk4i(3,4,1,2), Sk4i(1,2,3,4).zwxy());
     ASSERT_EQ(Sk4i(1,2,5,6), Sk4i::XYAB(Sk4i(1,2,3,4), Sk4i(5,6,7,8)));
     ASSERT_EQ(Sk4i(3,4,7,8), Sk4i::ZWCD(Sk4i(1,2,3,4), Sk4i(5,6,7,8)));
 }