[clang] [Clang] Fix HIP wrapper inclusion of 'algorithm' when using libc++ (PR #67981)

[Joseph Huber via cfe-commits]

https://github.com/jhuber6 created https://github.com/llvm/llvm-project/pull/67981

Summary:
The `algorithm` header included here sometimes caused issues when using
`libc++` over `libstdc++`. This was primarily because  of the order they
were included in. This patch just gets rid of this dependency as it was
only used for min and max which are trivial to reimplement.


>From 9a74030bdec5cade2a13ba5e260a22e61ebae5f8 Mon Sep 17 00:00:00 2001
From: Joseph Huber <jhuber6 at vols.utk.edu>
Date: Mon, 2 Oct 2023 07:25:03 -0500
Subject: [PATCH] [Clang] Fix HIP wrapper inclusion of 'algorithm' when using
 libc++

Summary:
The `algorithm` header included here sometimes caused issues when using
`libc++` over `libstdc++`. This was primarily because  of the order they
were included in. This patch just gets rid of this dependency as it was
only used for min and max which are trivial to reimplement.
---
 clang/lib/Headers/__clang_hip_math.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/clang/lib/Headers/__clang_hip_math.h b/clang/lib/Headers/__clang_hip_math.h
index 58aa55d74769031..11e1e7d032586f8 100644
--- a/clang/lib/Headers/__clang_hip_math.h
+++ b/clang/lib/Headers/__clang_hip_math.h
@@ -14,9 +14,6 @@
 #endif
 
 #if !defined(__HIPCC_RTC__)
-#if defined(__cplusplus)
-#include <algorithm>
-#endif
 #include <limits.h>
 #include <stdint.h>
 #ifdef __OPENMP_AMDGCN__
@@ -1311,11 +1308,11 @@ double min(double __x, double __y) { return __builtin_fmin(__x, __y); }
 
 #if !defined(__HIPCC_RTC__) && !defined(__OPENMP_AMDGCN__)
 __host__ inline static int min(int __arg1, int __arg2) {
-  return std::min(__arg1, __arg2);
+  return __arg1 < __arg2 ? __arg1 : __arg2;
 }
 
 __host__ inline static int max(int __arg1, int __arg2) {
-  return std::max(__arg1, __arg2);
+  return __arg1 > __arg2 ? __arg1 : __arg2;
 }
 #endif // !defined(__HIPCC_RTC__) && !defined(__OPENMP_AMDGCN__)
 #endif