[win][arm64ec] Handle Arm64EC for Clang CodeGen tests that current XFAIL AArch64 Windows

[dpaoliello]

• c-strings.c - add an XFAIL for Arm64EC and add a comment to explain the failure.
• volatile-1.c - add a regex for alignment during loads.

[llvmbot]

@llvm/pr-subscribers-platform-windows

@llvm/pr-subscribers-clang

Author: Daniel Paoliello (dpaoliello)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/153255.diff

2 Files Affected:

• (modified) clang/test/CodeGen/c-strings.c (+1-1)
• (modified) clang/test/CodeGen/volatile-1.c (+1-1)

diff --git a/clang/test/CodeGen/c-strings.c b/clang/test/CodeGen/c-strings.c
index 988deee317d4c..12c0bcd7f11ce 100644
--- a/clang/test/CodeGen/c-strings.c
+++ b/clang/test/CodeGen/c-strings.c
@@ -1,4 +1,4 @@
-// XFAIL: target=aarch64-pc-windows-{{.*}}
+// XFAIL: target=aarch64-pc-windows-{{.*}}, target=arm64ec-pc-windows-{{.*}}
 // RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK --check-prefix=ITANIUM
 // RUN: %clang_cc1 -triple %ms_abi_triple -emit-llvm -o - %s | FileCheck %s --check-prefix=CHECK --check-prefix=MSABI
 
diff --git a/clang/test/CodeGen/volatile-1.c b/clang/test/CodeGen/volatile-1.c
index 7116a4e1d03da..78b75e171054c 100644
--- a/clang/test/CodeGen/volatile-1.c
+++ b/clang/test/CodeGen/volatile-1.c
@@ -1,4 +1,4 @@
-// XFAIL: target=aarch64-pc-windows-msvc
+// XFAIL: target=aarch64-pc-windows-msvc, target=arm64ec-pc-windows-msvc
 // RUN: %clang_cc1 -Wno-return-type -Wno-unused-value -emit-llvm %s -w -o - | FileCheck %s
 
 // CHECK: @i = {{(dso_local )?}}global [[INT:i[0-9]+]] 0

[efriedma-quic]

Can you add a comment explaining why we're XFAIL'ing this?

[dpaoliello]

Done, using the same format as below.

[efriedma-quic]

LGTM