[llvm] [AMDGPU][Attributor] Stop inferring amdgpu-no-flat-scratch-init in sanitized functions. (PR #161319)

[Matt Arsenault via llvm-commits]

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@@ -467,17 +465,19 @@ struct AAAMDAttributesFunction : public AAAMDAttributes {
   void initialize(Attributor &A) override {
     Function *F = getAssociatedFunction();
 
-    // If the function requires the implicit arg pointer due to sanitizers,
-    // assume it's needed even if explicitly marked as not requiring it.
-    const bool NeedsHostcall = funcRequiresHostcallPtr(*F);
-    if (NeedsHostcall) {
+    // If the function has sanitizer attributes, we cannot remove
+    // implicitarg_ptr, hostcall_ptr, or flat_scratch_init.
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arsenm wrote:

Can you elaborate on why it requires this. Should have a fixme that flat_scratch_init should not be required 

https://github.com/llvm/llvm-project/pull/161319