[llvm] [Analysis] Attribute Range should not prevent tail call optimization (PR #91122)

[Andreas Jonson via llvm-commits]

================
@@ -0,0 +1,23 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -passes=ipsccp -S -mtriple=x86_64-linux < %s | llc -mtriple=x86_64-linux | FileCheck %s
+
+define i32 @foo(ptr %this, ...) {
+; CHECK-LABEL: foo:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movzbl 0, %eax
+; CHECK-NEXT:    retq
+entry:
+  %call = load volatile i1, ptr null, align 1
+  %spec.select = zext i1 %call to i32
+  ret i32 %spec.select
+}
+
+define i32 @bar(ptr %this, ...) {
+; CHECK-LABEL: bar:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xorl %edi, %edi
+; CHECK-NEXT:    jmp foo at PLT # TAILCALL
+entry:
+  %4 = musttail call i32 (ptr, ...) @foo(ptr null, ...)
----------------
andjo403 wrote:

think that it sounds good with simple test why not some thing like this instead of foo and bar
```
declare i32 @callee()

define range(i32 0, 2) i32 @func_with_range_attr() {
  %1 = musttail call i32 @callee()
  ret i32 %1
}

define i32 @call_with_range_attr() {
  %1 = musttail call range(i32 0, 2) i32 @callee()
  ret i32 %1
}
```

https://github.com/llvm/llvm-project/pull/91122