[test] [MCJIT] Don't overwrite config.unsupported to False

An outer directory may have set config.unsupported to True for
a different reason, separate from architecture concerns - we
shouldn't force it back to False just because one criterion is
fulfilled.

Differential Revision: https://reviews.llvm.org/D149995

Author: mstorsjo

llvm/test/ExecutionEngine/MCJIT/lit.local.cfg

@@ -1,15 +1,13 @@
 root = config.root
 targets = root.targets
-if (
+if not (
     ("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
@@ -21,6 +19,7 @@ if root.host_arch not in [
     "AMD64",
     "AArch64",
     "ARM",
+    "armv7",
     "Mips",
     "PowerPC",
     "ppc64",
@@ -29,9 +28,6 @@ if root.host_arch not in [
 ]:
     config.unsupported = True
 
-if "armv7" in root.host_arch:
-    config.unsupported = False
-
 if "i386-apple-darwin" in root.target_triple:
     config.unsupported = True