Revert "[lldb][test] Only add -m(64|32) for GCC on non Arm/AArch64 platforms"

This reverts commit 7c3603e.

Turns out when you ask for "clang" it also uses the GCC Builder class,
so I need to update some tests.

Author: DavidSpickett

lldb/test/Shell/helper/build.py

@@ -747,10 +747,7 @@ def _get_compilation_command(self, source, obj):
         args = []
 
         args.append(self.compiler)
-
-        uname = platform.uname().machine.lower()
-        if not "arm" in uname and not "aarch64" in uname:
-            args.append("-m" + self.arch)
+        args.append("-m" + self.arch)
 
         args.append("-g")
         if self.opt == "none":
@@ -787,11 +784,7 @@ def _get_compilation_command(self, source, obj):
     def _get_link_command(self):
         args = []
         args.append(self.compiler)
-
-        uname = platform.uname().machine.lower()
-        if not "arm" in uname and not "aarch64" in uname:
-            args.append("-m" + self.arch)
-
+        args.append("-m" + self.arch)
         if self.nodefaultlib:
             args.append("-nostdlib")
             args.append("-static")