RuntimeLibcalls: Fix stacksmash on arm64ec (#152116)

Fix after 5478da9

Author: arsenm

llvm/include/llvm/IR/RuntimeLibcalls.td

@@ -1247,9 +1247,12 @@ defset list<RuntimeLibcallImpl> WinArm64ECDefaultRuntimeLibcallImpls = {
   }
 }
 
+def arm64ec___stack_chk_fail : DuplicateLibcallImplWithPrefix<__stack_chk_fail, "#">;
+
 def WindowsARM64ECSystemLibrary
     : SystemRuntimeLibrary<isWindowsArm64EC,
-                           (add WinArm64ECDefaultRuntimeLibcallImpls)>;
+                           (add WinArm64ECDefaultRuntimeLibcallImpls,
+                                arm64ec___stack_chk_fail)>;
 
 //===----------------------------------------------------------------------===//
 // AMDGPU Runtime Libcalls

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

@@ -0,0 +1,16 @@
+; RUN: llc -mtriple=arm64ec-unknown-windows-gnu < %s | FileCheck %s
+
+; CHECK-LABEL: func = "#func"
+; CHECK: bl "#other"
+; CHECK: bl "#__stack_chk_fail"
+define void @func() #0 {
+entry:
+  %buf = alloca [10 x i8], align 1
+  call void @other(ptr %buf) #1
+  ret void
+}
+
+declare void @other(ptr) #1
+
+attributes #0 = { nounwind sspstrong }
+attributes #1 = { nounwind }