[libc] fix error: implicit conversion loses floating-point precision: 'double' to 'float' in shared_math_test.cpp

Author: makslevental

libc/test/shared/shared_math_test.cpp

@@ -57,7 +57,8 @@ TEST(LlvmLibcSharedMathTest, AllFloat) {
   EXPECT_FP_EQ(0x1p+0f, LIBC_NAMESPACE::shared::cosf(0.0f));
   EXPECT_FP_EQ(0x1p+0f, LIBC_NAMESPACE::shared::coshf(0.0f));
   EXPECT_FP_EQ(0x1p+0f, LIBC_NAMESPACE::shared::cospif(0.0f));
-  EXPECT_FP_EQ(0x0p+0f, LIBC_NAMESPACE::shared::dsqrtl(0.0f));
+  EXPECT_FP_EQ(0x0p+0f,
+               static_cast<float>(LIBC_NAMESPACE::shared::dsqrtl(0.0f)));
   EXPECT_FP_EQ(0x0p+0f, LIBC_NAMESPACE::shared::erff(0.0f));
   EXPECT_FP_EQ(0x1p+0f, LIBC_NAMESPACE::shared::exp10f(0.0f));
   EXPECT_FP_EQ(0x1p+0f, LIBC_NAMESPACE::shared::expf(0.0f));