Make sure LldbGdbServerTestCase is built in arm mode to avoid failures due thumb instructions

[omjavaid]

Summary

LldbGdbServerTestCase.test_software_breakpoint_set* are failing when breakpoint target address is an thumb16 instruction.

Test right now doesnt handle thumb mode which means that it should only be built in arm mode using -marm flag in gcc.

This patch makes sure that we are building this test in arm mode.

lldb/trunk/packages/Python/lldbsuite/test/tools/lldb-server/Makefile

 LEVEL = ../../make
 
-CFLAGS_EXTRAS += -D__STDC_LIMIT_MACROS -D__STDC_FORMAT_MACROS
+override CFLAGS_EXTRAS += -D__STDC_LIMIT_MACROS -D__STDC_FORMAT_MACROS
 ENABLE_THREADS := YES
 CXX_SOURCES := main.cpp
 MAKE_DSYM :=NO
 
 include $(LEVEL)/Makefile.rules

lldb/trunk/packages/Python/lldbsuite/test/tools/lldb-server/TestLldbGdbServer.py

def software_breakpoint_set_and_remove_work(self):
             ], True)
 
         context = self.expect_gdbremote_sequence()
         self.assertIsNotNone(context)
 
     @debugserver_test
     def test_software_breakpoint_set_and_remove_work_debugserver(self):
         self.init_debugserver_test()
+        if self.getArchitecture() == "arm":
+            # TODO: Handle case when setting breakpoint in thumb code
+            self.build(dictionary={'CFLAGS_EXTRAS': '-marm'})
+        else:
             self.build()
         self.set_inferior_startup_launch()
         self.software_breakpoint_set_and_remove_work()
 
     @llgs_test
     @expectedFlakeyLinux("llvm.org/pr25652")
     def test_software_breakpoint_set_and_remove_work_llgs(self):
         self.init_llgs_test()
+        if self.getArchitecture() == "arm":
+            # TODO: Handle case when setting breakpoint in thumb code
+            self.build(dictionary={'CFLAGS_EXTRAS': '-marm'})
+        else:
             self.build()
         self.set_inferior_startup_launch()
         self.software_breakpoint_set_and_remove_work()
 
     def qSupported_returns_known_stub_features(self):
         # Start up the stub and start/prep the inferior.
         procs = self.prep_debug_monitor_and_inferior()
         self.add_qSupported_packets()