[libspirv] Add __spirv_BitReverse implementation (#20449)

Also include a few NFC changes.

Author: wenju-he

libclc/libspirv/lib/generic/SOURCES

@@ -39,6 +39,7 @@ geometric/scale.cl
 integer/abs.cl
 integer/abs_diff.cl
 integer/add_sat.cl
+integer/bit_reverse.cl
 integer/clamp.cl
 integer/clz.cl
 integer/ctz.cl

libclc/libspirv/lib/generic/integer/BitCount.cl

@@ -6,10 +6,11 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <clc/integer/clc_popcount.h>
 #include <libspirv/spirv.h>
 
 #define __CLC_FUNCTION __spirv_BitCount
-#define __CLC_IMPL_FUNCTION(x) __spirv_ocl_popcount
+#define __CLC_IMPL_FUNCTION(x) __clc_popcount
 #define __CLC_BODY <clc/shared/unary_def.inc>
 
 #include <clc/integer/gentype.inc>

libclc/libspirv/lib/generic/integer/abs.cl

@@ -6,7 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <clc/internal/clc.h>
 #include <clc/integer/clc_abs.h>
 #include <libspirv/spirv.h>
 

libclc/libspirv/lib/generic/integer/abs_diff.cl

@@ -6,7 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <clc/internal/clc.h>
 #include <clc/integer/clc_abs_diff.h>
 #include <libspirv/spirv.h>
 

libclc/libspirv/lib/generic/integer/bit_reverse.cl

@@ -0,0 +1,15 @@
+//===----------------------------------------------------------------------===//
+//
+// 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/integer/clc_bit_reverse.h>
+#include <libspirv/spirv.h>
+
+#define __CLC_FUNCTION __spirv_BitReverse
+#define __CLC_IMPL_FUNCTION(x) __clc_bit_reverse
+#define __CLC_BODY <clc/shared/unary_def.inc>
+#include <clc/integer/gentype.inc>

libclc/libspirv/lib/generic/integer/popcount.cl

@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <libspirv/spirv.h>
 #include <clc/integer/clc_popcount.h>
+#include <libspirv/spirv.h>
 
 #define __CLC_FUNCTION __spirv_ocl_popcount
 #define __CLC_IMPL_FUNCTION(x) __clc_popcount