Automerge: [clang][ARM] Include arm_acle.h in intrin.h on supported platforms (#144172)

Right now when using ARM intrinsics without including `arm_acle.h`, we
throw a warning saying to include it or provide a declaration for the
function.
MSVC doesn't have any ARM-intrinsic specific header, so include Clang's
ARM intrinsic header (`arm_acle.h`) in `intrin.h` so we don't get a
warning that tells the user to include a header that doesn't exist.
Ideally we could change the header based on the platform, but we don't
have the infra for that at the moment.

See llvm/llvm-project#140910 for more info.

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

clang/lib/Headers/intrin.h

@@ -30,6 +30,10 @@
 #include <arm64intr.h>
 #endif
 
+#if defined(__ARM_ACLE)
+#include <arm_acle.h>
+#endif
+
 /* For the definition of jmp_buf. */
 #if __STDC_HOSTED__
 #include <setjmp.h>

clang/test/Headers/arm-acle-no-direct-include.c

@@ -0,0 +1,8 @@
+// RUN: %clang_cl --target=aarch64-windows-msvc -Xclang -verify /E -U__STDC_HOSTED__ -Wno-builtin-macro-redefined %s 2>&1 | FileCheck %s
+
+// expected-no-diagnostics
+
+// CHECK: void __yield(void);
+#include <intrin.h>
+void f() { __yield(); }
+