Add a build patch for Windows ARM64EC (#19898)

### Description
Add a patch for Windows ARM64EC


### Motivation and Context
Will need more changes in onnxruntime/core/common/cpuid_arch_definition.h and onnxruntime/core/common/cpuid_info.cc

cmake/external/onnxruntime_external_deps.cmake

@@ -305,13 +305,23 @@ if (CPUINFO_SUPPORTED)
   set(CPUINFO_BUILD_UNIT_TESTS OFF CACHE INTERNAL "")
   set(CPUINFO_BUILD_MOCK_TESTS OFF CACHE INTERNAL "")
   set(CPUINFO_BUILD_BENCHMARKS OFF CACHE INTERNAL "")
-
-  FetchContent_Declare(
-    pytorch_cpuinfo
-    URL ${DEP_URL_pytorch_cpuinfo}
-    URL_HASH SHA1=${DEP_SHA1_pytorch_cpuinfo}
-    FIND_PACKAGE_ARGS NAMES cpuinfo
-  )
+  if(onnxruntime_target_platform STREQUAL "ARM64EC")
+      message("Applying a patch for Windows ARM64EC in cpuinfo")
+      FetchContent_Declare(
+        pytorch_cpuinfo
+        URL ${DEP_URL_pytorch_cpuinfo}
+        URL_HASH SHA1=${DEP_SHA1_pytorch_cpuinfo}
+        PATCH_COMMAND ${Patch_EXECUTABLE} -p1 < ${PROJECT_SOURCE_DIR}/patches/cpuinfo/9bb12d342fd9479679d505d93a478a6f9cd50a47.patch
+        FIND_PACKAGE_ARGS NAMES cpuinfo
+      )
+  else()
+      FetchContent_Declare(
+        pytorch_cpuinfo
+        URL ${DEP_URL_pytorch_cpuinfo}
+        URL_HASH SHA1=${DEP_SHA1_pytorch_cpuinfo}
+        FIND_PACKAGE_ARGS NAMES cpuinfo
+      )
+  endif()
   set(ONNXRUNTIME_CPUINFO_PROJ pytorch_cpuinfo)
 endif()
 

cmake/patches/cpuinfo/9bb12d342fd9479679d505d93a478a6f9cd50a47.patch

@@ -0,0 +1,22 @@
+diff --git a/include/cpuinfo.h b/include/cpuinfo.h
+index c46b65e..8b83a64 100644
+--- a/include/cpuinfo.h
++++ b/include/cpuinfo.h
+@@ -18,7 +18,7 @@
+ 	#define CPUINFO_ARCH_X86 1
+ #endif
+
+-#if defined(__x86_64__) || defined(__x86_64) || defined(_M_X64) || defined(_M_AMD64)
++#if defined(__x86_64__) || (defined(_M_X64) && !defined(_M_ARM64EC)) || (defined(_M_AMD64) && !defined(_M_ARM64EC))
+ 	#define CPUINFO_ARCH_X86_64 1
+ #endif
+
+@@ -26,7 +26,7 @@
+ 	#define CPUINFO_ARCH_ARM 1
+ #endif
+
+-#if defined(__aarch64__) || defined(_M_ARM64)
++#if defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)
+ 	#define CPUINFO_ARCH_ARM64 1
+ #endif
+