[libc][NFC] Move RandUtils.h to test/src/math.

[sivachandra]

Summary

It is currently used only by math tests so moving it to test/src/math
keeps it closer to where it is used.

libc/test/src/CMakeLists.txt

function(add_fp_unittest name)
   if(MATH_UNITTEST_NEED_MPFR)
     if(NOT LIBC_TESTS_CAN_USE_MPFR)
       message("WARNING: Math test ${name} will be skipped as MPFR library is not available.")
       return()
     endif()
   endif()
 
   if(MATH_UNITTEST_NEED_MPFR)
-    list(APPEND MATH_UNITTEST_LINK_LIBRARIES libcMPFRWrapper -lmpfr -lgmp)
+    list(APPEND MATH_UNITTEST_LINK_LIBRARIES libcMPFRWrapper libc_math_test_utils -lmpfr -lgmp)
   endif()
   list(APPEND MATH_UNITTEST_LINK_LIBRARIES LibcFPTestHelpers)
 
   add_libc_unittest(
     ${name}
     LINK_LIBRARIES "${MATH_UNITTEST_LINK_LIBRARIES}"
     "${MATH_UNITTEST_UNPARSED_ARGUMENTS}"
   )

libc/test/src/math/CMakeLists.txt

 add_libc_testsuite(libc_math_unittests)
 
+add_library(
+  libc_math_test_utils
+  RandUtils.cpp
+  RandUtils.h
+)
+
 add_fp_unittest(
   cosf_test
   NEED_MPFR
   SUITE
     libc_math_unittests
   SRCS
     cosf_test.cpp
   HDRS

libc/test/src/math/FmaTest.h

 //===-- Utility class to test different flavors of fma --------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIBC_TEST_SRC_MATH_FMATEST_H
 #define LLVM_LIBC_TEST_SRC_MATH_FMATEST_H
 
 #include "src/__support/FPUtil/FPBits.h"
 #include "test/UnitTest/FPMatcher.h"
 #include "test/UnitTest/Test.h"
+#include "test/src/math/RandUtils.h"
 #include "utils/MPFRWrapper/MPFRUtils.h"
-#include "utils/testutils/RandUtils.h"
 
 namespace mpfr = __llvm_libc::testing::mpfr;
 
 template <typename T>
 class FmaTestTemplate : public __llvm_libc::testing::Test {
 private:
   using Func = T (*)(T, T, T);
   using FPBits = __llvm_libc::fputil::FPBits<T>;

libc/utils/testutils/CMakeLists.txt

 if(CMAKE_HOST_UNIX)
   set(EFFile ExecuteFunctionUnix.cpp)
   set(FDReaderFile FDReaderUnix.cpp)
 endif()
 
 add_library(
   libc_test_utils
-  RandUtils.cpp
-  RandUtils.h
   StreamWrapper.cpp
   StreamWrapper.h
   ${EFFile}
   ExecuteFunction.h
   ${FDReaderFile}
   FDReader.h
   RoundingModeUtils.cpp
 )