[llvm-profgen] A couple tweaks to the testing harness.

1. Remove unnecessary filtering code.
2. Add llvm-profgen to tool substitutions.

Reviewed By: wenlei

Differential Revision: https://reviews.llvm.org/D101006

llvm/test/lit.cfg.py

@@ -161,7 +161,7 @@ tools.extend([
     'llvm-install-name-tool', 'llvm-jitlink', 'llvm-opt-fuzzer', 'llvm-lib',
     'llvm-link', 'llvm-lto', 'llvm-lto2', 'llvm-mc', 'llvm-mca',
     'llvm-modextract', 'llvm-nm', 'llvm-objcopy', 'llvm-objdump', 'llvm-otool',
-    'llvm-pdbutil', 'llvm-profdata', 'llvm-ranlib', 'llvm-rc', 'llvm-readelf',
+    'llvm-pdbutil', 'llvm-profdata', 'llvm-profgen', 'llvm-ranlib', 'llvm-rc', 'llvm-readelf',
     'llvm-readobj', 'llvm-rtdyld', 'llvm-size', 'llvm-split', 'llvm-strings',
     'llvm-strip', 'llvm-tblgen', 'llvm-undname', 'llvm-c-test', 'llvm-cxxfilt',
     'llvm-xray', 'yaml2obj', 'obj2yaml', 'yaml-bench', 'verify-uselistorder',

llvm/test/tools/llvm-profgen/lit.local.cfg

@@ -2,8 +2,6 @@ import subprocess
 import lit.util
 
 config.suffixes = ['.test', '.ll', '.s', '.yaml']
-if not lit.util.which("llvm-profgen", config.llvm_tools_dir):
-  config.unsupported = True
 
 if not 'X86' in config.root.targets:
   config.unsupported = True