Remove building llvm2ice.build_atts from Subzero build.

tests_lit/lit.cfg

Index: tests_lit/lit.cfg
diff --git a/tests_lit/lit.cfg b/tests_lit/lit.cfg
index 1233a76d4fbf7e8d0ebbe2b2af7096320e0c0819..3b7bf5c4d910fff351ef3ea4db177633f4591617 100644
--- a/tests_lit/lit.cfg
+++ b/tests_lit/lit.cfg
@@ -39,7 +39,7 @@ import sys
 import lit.formats
 
 sys.path.insert(0, 'pydir')
-from utils import FindBaseNaCl
+from utils import FindBaseNaCl, shellcmd
 from ifatts import GetFileAttributes
 
 # name: The name of this test suite.
@@ -69,18 +69,23 @@ llvmbinpath = os.path.abspath(os.environ.get('LLVM_BIN_PATH'))
 
 # Define the location of the llvm2ice tool.
 llvm2icetool = os.path.join(bin_root, 'llvm2ice')
-llvm2icetoolatts = os.path.join(bin_root, 'llvm2ice.build_atts')
+llvm2iceatts = shellcmd(' '.join([llvm2icetool, '--build-atts']),
+                        echo=False).split()
 
 # Add build attributes of llvm2ice tool to the set of available features.
-config.available_features.update(GetFileAttributes(llvm2icetoolatts))
+config.available_features.update(llvm2iceatts)
 
-# Base command for testing build attributes
-if_atts_base = [os.path.join(pydir, 'ifatts.py'), llvm2icetoolatts]
-if_atts_cmd = if_atts_base + ['--command']
-ifl2i_atts_cmd = if_atts_base + ['--att=allow_llvm_ir', '--command']
-iflc2i_atts_cmd = if_atts_base + ['--att=allow_llvm_ir',
-                                  '--att=allow_llvm_ir_as_input',
-                                  '--command']
+def if_cond_flag(Value):
+  return '--cond=true' if Value else '--cond=false'
+
+# shell conditional commands.
+if_atts = [os.path.join(pydir, 'if.py')]
+if_atts_cmd = if_atts + ['--have=' + att
+                         for att in llvm2iceatts] + ['--command']
+ifl2i_atts_cmd = if_atts + [if_cond_flag('allow_llvm_ir' in llvm2iceatts),
+                            '--command']
+iflc2i_atts_cmd = if_atts + [if_cond_flag('allow_llvm_ir_as_input'
+                                          in llvm2iceatts), '--command']
 
 # Base command for running llvm2ice
 llvm2ice_cmd = [os.path.join(pydir, 'run-llvm2ice.py'),
@@ -129,3 +134,4 @@ def dbg(s):
 
 dbg('bin_root = %s' % bin_root)
 dbg('llvmbinpath = %s' % llvmbinpath)
+dbg("Build attributes = %s" % llvm2iceatts)