[lit] Make ExecutionEngine tests run when LLVM_TARGET_ARCH != 'host' and the target is supported.

[dsanders]

Summary

This is necessary for the clang-cmake-mips builder where the host arch is
'mips64' but we are targeting and can execute code for the 'Mips' architecture.

[dsanders]

Abandoning an old patch.

test/ExecutionEngine/MCJIT/lit.local.cfg

 root = config.root
 targets = root.targets
 if ('X86' in targets) | ('AArch64' in targets) | ('ARM' in targets) | \
    ('Mips' in targets) | ('PowerPC' in targets) | ('SystemZ' in targets):
     config.unsupported = False
 else:
     config.unsupported = True
 
 # FIXME: autoconf and cmake produce different arch names. We should normalize
 # them before getting here.
-if root.host_arch not in ['i386', 'x86', 'x86_64', 'AMD64',
-                          'AArch64', 'ARM', 'Mips', 'PowerPC', 'ppc64', 'SystemZ']:
+if root.jit_target_arch not in ['i386', 'x86', 'x86_64', 'AMD64',
+                                'AArch64', 'ARM', 'Mips', 'PowerPC', 'ppc64',
+                                'SystemZ']:
     config.unsupported = True
 
-if 'armv7' in root.host_arch:
+if 'armv7' in root.jit_target_arch:
     config.unsupported = False
 
 if 'i386-apple-darwin' in root.target_triple:
     config.unsupported = True
 
 if 'powerpc' in root.target_triple and not 'powerpc64' in root.target_triple:
     config.unsupported = True
 
 # ExecutionEngine tests are not expected to pass in a cross-compilation setup.
 if 'native' not in config.available_features:
     config.unsupported = True

test/ExecutionEngine/OrcLazy/lit.local.cfg

-if config.root.host_arch not in ['x86_64']:
+if config.root.jit_target_arch not in ['x86_64']:
     config.unsupported = True

test/ExecutionEngine/OrcMCJIT/lit.local.cfg

 root = config.root
 targets = root.targets
 if ('X86' in targets) | ('AArch64' in targets) | ('ARM' in targets) | \
    ('Mips' in targets) | ('PowerPC' in targets) | ('SystemZ' in targets):
     config.unsupported = False
 else:
     config.unsupported = True
 
 # FIXME: autoconf and cmake produce different arch names. We should normalize
 # them before getting here.
-if root.host_arch not in ['i386', 'x86', 'x86_64', 'AMD64',
-                          'AArch64', 'ARM', 'Mips', 'PowerPC', 'ppc64', 'SystemZ']:
+if root.jit_target_arch not in ['i386', 'x86', 'x86_64', 'AMD64',
+                                'AArch64', 'ARM', 'Mips', 'PowerPC', 'ppc64',
+                                'SystemZ']:
     config.unsupported = True
 
-if 'armv7' in root.host_arch:
+if 'armv7' in root.jit_target_arch:
     config.unsupported = False
 
 if 'i386-apple-darwin' in root.target_triple:
     config.unsupported = True
 
 if 'powerpc' in root.target_triple and not 'powerpc64' in root.target_triple:
     config.unsupported = True
 
 # ExecutionEngine tests are not expected to pass in a cross-compilation setup.
 if 'native' not in config.available_features:
     config.unsupported = True

test/ExecutionEngine/lit.local.cfg

-if config.root.host_arch in ['PowerPC', 'AArch64', 'SystemZ']:
+if config.root.jit_target_arch in ['PowerPC', 'AArch64', 'SystemZ']:
     config.unsupported = True
 
 # CMake and autoconf diverge in naming or host_arch
 if 'powerpc64' in config.root.target_triple:
     config.unsupported = True
 
 if 'aarch64' in config.root.target_triple \
     or 'arm64' in config.root.target_triple:
         config.unsupported = True
 
 if 'hexagon' in config.root.target_triple:
     config.unsupported = True
 
 # ExecutionEngine tests are not expected to pass in a cross-compilation setup.
 if 'native' not in config.available_features:
     config.unsupported = True

test/lit.site.cfg.in

 config.host_cc = "@HOST_CC@"
 config.host_cxx = "@HOST_CXX@"
 config.host_ldflags = "@HOST_LDFLAGS@"
 config.llvm_use_intel_jitevents = "@LLVM_USE_INTEL_JITEVENTS@"
 config.llvm_use_sanitizer = "@LLVM_USE_SANITIZER@"
 config.have_zlib = "@HAVE_LIBZ@"
 config.have_dia_sdk = @HAVE_DIA_SDK@
 config.enable_ffi = "@LLVM_ENABLE_FFI@"
+config.jit_target_arch = "@LLVM_TARGET_ARCH@"
+if config.jit_target_arch == "host":
+  config.jit_target_arch = config.host_arch
 
 # Support substitution of the tools_dir with user parameters. This is
 # used when we can't determine the tool dir at configuration time.
 try:
     config.llvm_tools_dir = config.llvm_tools_dir % lit_config.params
     config.llvm_shlib_dir = config.llvm_shlib_dir % lit_config.params
 except KeyError:
     e = sys.exc_info()[1]
     key, = e.args
     lit_config.fatal("unable to find %r parameter, use '--param=%s=VALUE'" % (key,key))
 
 # Let the main config do the real work.
 lit_config.load_config(config, "@LLVM_SOURCE_DIR@/test/lit.cfg")