Tweak a couple of tests on win32 hosts with +Asserts.

- Don't use assert(0), or tests may pass or fail according to assertions.
  - For now, The tests are marked as XFAIL for win32 hosts.

FIXME: Could we avoid XFAIL to specify triple in the RUN lines?

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183728 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp

@@ -681,7 +681,7 @@ MCAsmBackend *llvm::createARMAsmBackend(const Target &T, StringRef TT, StringRef
   }
 
   if (TheTriple.isOSBinFormatCOFF())
-    assert(0 && "Windows not supported on ARM");
+    llvm_unreachable("Windows not supported on ARM");
 
   uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS());
   return new ELFARMAsmBackend(T, TT, OSABI);

test/MC/ARM/arm-thumb-cpus-default.s

@@ -5,6 +5,9 @@
 @ RUN: llvm-mc -show-encoding -triple=armv7m < %s | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
 @ RUN: llvm-mc -show-encoding -triple=armv6m < %s | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
 
+@ FIXME: Could we avoid XFAIL to specify triple above?
+@ XFAIL: cygwin,mingw32,win32
+
         @ Make sure the architecture chosen by LLVM defaults to a compatible
         @ ARM/Thumb mode.
         movs r0, r0

test/MC/ARM/arm-thumb-cpus.s

@@ -5,6 +5,9 @@
 @ RUN: llvm-mc -show-encoding -triple=armv7m < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
 @ RUN: llvm-mc -show-encoding -triple=armv6m < %s 2>&1 | FileCheck %s --check-prefix=CHECK-THUMB-ONLY
 
+@ FIXME: Could we avoid XFAIL to specify triple above?
+@ XFAIL: cygwin,mingw32,win32
+
         @ Make sure correct diagnostics are given for CPUs without support for
         @ one or other of the execution states.
         .thumb