Fix after llvm#121482 (llvm#121764)

Author: JoelWee

libc/src/stdlib/qsort_pivot.h

@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_SRC_STDLIB_QSORT_PIVOT_H
 #define LLVM_LIBC_SRC_STDLIB_QSORT_PIVOT_H
 
-#include <stdint.h>
+#include <stddef.h>  // For size_t
 
 namespace LIBC_NAMESPACE_DECL {
 namespace internal {

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -3481,11 +3481,13 @@ libc_support_library(
     hdrs = [
         "src/stdlib/heap_sort.h",
         "src/stdlib/qsort_data.h",
+        "src/stdlib/qsort_pivot.h",
         "src/stdlib/qsort_util.h",
         "src/stdlib/quick_sort.h",
     ],
     deps = [
         ":__support_common",
+        ":__support_cpp_bit",
         ":__support_cpp_cstddef",
         ":__support_macros_attributes",
     ],