[libc] Add differential and performance targets for sqrtf

Comparing the runtime of the sqrt functions from LLVM libc with the system libc:
|function       |perf - LLVM libc          |perf - MSVCRT
|sqrtf - Windows|44.05 sec (44051715500 ns)| 417.84 sec (417843359900 ns) = 6.96 mins

|function       |perf - LLVM libc          |perf - glibc
|sqrtf - Linux  |30.48 sec (30479458632 ns)|43.72 sec (43716901527 ns)

By running the differential test:
|function       |diff
|sqrtf - Windows|0 differing results
|sqrtf - Linux  |0 differing results

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D107229

Author: HedGarcia

libc/test/src/math/differential_testing/CMakeLists.txt

@@ -126,3 +126,23 @@ add_diff_binary(
   COMPILE_OPTIONS
     -fno-builtin
 )
+
+add_diff_binary(
+  sqrtf_diff
+  SRCS
+    sqrtf_diff.cpp
+  DEPENDS
+    .single_input_single_output_diff
+    libc.src.math.sqrtf
+)
+
+add_diff_binary(
+  sqrtf_perf
+  SRCS
+    sqrtf_perf.cpp
+  DEPENDS
+    .single_input_single_output_diff
+    libc.src.math.sqrtf
+  COMPILE_OPTIONS
+    -fno-builtin
+)

libc/test/src/math/differential_testing/sqrtf_diff.cpp

@@ -0,0 +1,17 @@
+//===-- Differential test for sqrtf
+//----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "SingleInputSingleOutputDiff.h"
+
+#include "src/math/sqrtf.h"
+
+#include <math.h>
+
+SINGLE_INPUT_SINGLE_OUTPUT_DIFF(float, __llvm_libc::sqrtf, ::sqrtf,
+                                "sqrtf_diff.log")

libc/test/src/math/differential_testing/sqrtf_perf.cpp

@@ -0,0 +1,17 @@
+//===-- Differential test for sqrtf
+//----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "SingleInputSingleOutputDiff.h"
+
+#include "src/math/sqrtf.h"
+
+#include <math.h>
+
+SINGLE_INPUT_SINGLE_OUTPUT_PERF(float, __llvm_libc::sqrtf, ::sqrtf,
+                                "sqrtf_perf.log")