[CodeGen][ARM64EC][NFC] Add ARM64EC alias symbols test. (#92100)

Author: cjacek

llvm/test/CodeGen/AArch64/arm64ec-symbols.ll

@@ -0,0 +1,27 @@
+; RUN: llc -mtriple=arm64ec-pc-windows-msvc < %s | FileCheck %s
+; RUN: llc -mtriple=arm64ec-pc-windows-msvc -filetype=obj -o %t.o < %s
+; RUN: llvm-objdump -t %t.o | FileCheck --check-prefix=SYM %s
+
+declare void @func() nounwind;
+
+define void @caller() nounwind {
+  call void @func()
+  ret void
+}
+
+; CHECK:      .weak_anti_dep  caller
+; CHECK-NEXT: .set caller, "#caller"@WEAKREF
+
+; CHECK:      .weak_anti_dep  func
+; CHECK-NEXT: .set func, "#func"@WEAKREF
+; CHECK-NEXT: .weak_anti_dep  "#func"
+; CHECK-NEXT: .set "#func", "#func$exit_thunk"@WEAKREF
+
+; SYM:       [ 8](sec  4)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x00000000 #caller
+; SYM:       [21](sec  7)(fl 0x00)(ty  20)(scl   2) (nx 0) 0x00000000 #func$exit_thunk
+; SYM:       [33](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 caller
+; SYM-NEXT:  AUX indx 8 srch 4
+; SYM-NEXT:  [35](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 #func
+; SYM-NEXT:  AUX indx 21 srch 4
+; SYM:       [39](sec  0)(fl 0x00)(ty   0)(scl  69) (nx 1) 0x00000000 func
+; SYM-NEXT:  AUX indx 35 srch 4