[libspirv][math] Implement OpFMod and OpFRem (#20644)

The previous commit 446a453 was reverted due to fail on Windows
where file name is case-insensitive.

Author: wenju-he

libclc/libspirv/lib/generic/SOURCES

@@ -93,6 +93,7 @@ math/fmin.cl
 math/fmin_common.cl
 math/fmod.cl
 math/fract.cl
+math/frem.cl
 math/frexp.cl
 math/half_cos.cl
 math/half_divide.cl

libclc/libspirv/lib/generic/math/fmod.cl

@@ -6,10 +6,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <libspirv/spirv.h>
+#include <clc/math/clc_copysign.h>
 #include <clc/math/clc_fmod.h>
+#include <libspirv/spirv.h>
 
 #define __CLC_FUNCTION __spirv_ocl_fmod
 #define __CLC_IMPL_FUNCTION(x) __clc_fmod
 #define __CLC_BODY <clc/shared/binary_def.inc>
 #include <clc/math/gentype.inc>
+
+#define __CLC_BODY <fmod.inc>
+#include <clc/math/gentype.inc>

libclc/libspirv/lib/generic/math/fmod.inc

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE __spirv_FMod(__CLC_GENTYPE x,
+                                                  __CLC_GENTYPE y) {
+  return __clc_copysign(__clc_fmod(x, y), y);
+}

libclc/libspirv/lib/generic/math/frem.cl

@@ -0,0 +1,16 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 <clc/math/clc_fmod.h>
+#include <libspirv/spirv.h>
+
+#define __CLC_FUNCTION __spirv_FRem
+#define __CLC_IMPL_FUNCTION(x) __clc_fmod
+#define __CLC_BODY <clc/shared/binary_def.inc>
+
+#include <clc/math/gentype.inc>