[clang] [llvm] [Clang][AMDGPU] Add builtins for some buffer resource atomics (PR #149216)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -triple amdgcn-unknown-unknown -S -verify=expected -o - %s
+// REQUIRES: amdgpu-registered-target
+
+void test_raw_ptr_atomics(__amdgpu_buffer_rsrc_t rsrc, float f32, double f64, int offset, int soffset) {
+  f32 = __builtin_amdgcn_raw_ptr_buffer_atomic_fmax_f32(f32, rsrc, offset, soffset, 0); // expected-error{{'__builtin_amdgcn_raw_ptr_buffer_atomic_fmax_f32' needs target feature atomic-fmin-fmax-global-f32}}
+  f64 = __builtin_amdgcn_raw_ptr_buffer_atomic_fmax_f64(f64, rsrc, offset, soffset, 0); // expected-error{{'__builtin_amdgcn_raw_ptr_buffer_atomic_fmax_f64' needs target feature atomic-fmin-fmax-global-f64}}
+}
----------------
arsenm wrote:

Missing fmin cases 

https://github.com/llvm/llvm-project/pull/149216