Disable llvm-objdump --debug-vars tests on Windows

These tests passed in my Windows 10 VM, but are failing on Windows bots
with errors which look related to unicode encodings. Disable the tests
on Windows for now.

Author: ostannard

llvm/test/tools/llvm-objdump/ARM/debug-vars-dwarf4-sections.s

@@ -4,6 +4,9 @@
 ## Generated with this compile command, with the source code in Inputs/debug.c:
 ## clang --target=arm--none-eabi -march=armv7-a -c debug.c -O1 -gdwarf-4 -S -o - -ffunction-sections
 
+## The unicode characters in this test cause test failures on Windows.
+# UNSUPPORTED: system-windows
+
 # RUN: llvm-mc -triple armv8a--none-eabi < %s -filetype=obj | \
 # RUN:     llvm-objdump - -d --debug-vars --no-show-raw-insn | \
 # RUN:     FileCheck %s

llvm/test/tools/llvm-objdump/ARM/debug-vars-dwarf4.s

@@ -8,6 +8,9 @@
 ## Generated with this compile command, with the source code in Inputs/debug.c:
 ## clang --target=arm--none-eabi -march=armv7-a -c debug.c -O1 -gdwarf-4 -S -o -
 
+## The unicode characters in this test cause test failures on Windows.
+# UNSUPPORTED: system-windows
+
 # RUN: llvm-mc -triple armv8a--none-eabi < %s -filetype=obj | \
 # RUN:     llvm-objdump - -d --debug-vars | \
 # RUN:     FileCheck %s --check-prefix=RAW --strict-whitespace

llvm/test/tools/llvm-objdump/ARM/debug-vars-dwarf5-sections.s

@@ -4,6 +4,9 @@
 ## Generated with this compile command, with the source code in Inputs/debug.c:
 ## clang --target=arm--none-eabi -march=armv7-a -c debug.c -O1 -gdwarf-5 -S -o - -ffunction-sections
 
+## The unicode characters in this test cause test failures on Windows.
+# UNSUPPORTED: system-windows
+
 # RUN: llvm-mc -triple armv8a--none-eabi < %s -filetype=obj --dwarf-version=5 | \
 # RUN:     llvm-objdump - -d --debug-vars --no-show-raw-insn | \
 # RUN:     FileCheck %s

llvm/test/tools/llvm-objdump/ARM/debug-vars-dwarf5.s

@@ -4,6 +4,9 @@
 ## Generated with this compile command, with the source code in Inputs/debug.c:
 ## clang --target=arm--none-eabi -march=armv7-a -c debug.c -O1 -gdwarf-3 -S -o -
 
+## The unicode characters in this test cause test failures on Windows.
+# UNSUPPORTED: system-windows
+
 # RUN: llvm-mc -triple armv8a--none-eabi < %s -filetype=obj --dwarf-version=5 | \
 # RUN:     llvm-objdump - -d --debug-vars --no-show-raw-insn | \
 # RUN:     FileCheck %s

llvm/test/tools/llvm-objdump/PowerPC/debug-vars.s

@@ -2,10 +2,11 @@
 ## using DWARF4 debug info, with multiple functions in one section.
 
 ## Generated with this compile command and source code:
-## clang --target=arm--none-eabi -march=armv7-a -c debug.c -O1 -gdwarf-3 -S -o -
-
 ## clang --target=powerpc64-unknown-linux -c debug.c -O1 -S -o -
 
+## The unicode characters in this test cause test failures on Windows.
+# UNSUPPORTED: system-windows
+
 ## int foo(int a, int b, int c) {
 ##   int x = a + b;
 ##   int y = x + c;