[lit] Run lit -s -vv by default instead of lit -sv

[foad]

Summary

This makes lit show you which command failed for a failing test, which
is really useful information for a test with many independent RUN lines.

[merge_guards_bot]

Unit tests: pass. 61306 tests passed, 0 failed and 736 were skipped.

clang-tidy: pass.

clang-format: pass.

Build artifacts: diff.json, clang-tidy.txt, clang-format.patch, CMakeCache.txt, console-log.txt, test-results.xml

llvm/CMakeLists.txt

 # platforms, where supported.
 if( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
   # TODO: support other platforms and toolchains.
   option(LLVM_BUILD_32_BITS "Build 32 bits executables and libraries." OFF)
 endif()
 
 # Define the default arguments to use with 'lit', and an option for the user to
 # override.
-set(LIT_ARGS_DEFAULT "-sv")
+set(LIT_ARGS_DEFAULT "-s -vv")
 if (MSVC_IDE OR XCODE)
   set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
 endif()
 set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
 
 # On Win32 hosts, provide an option to specify the path to the GnuWin32 tools.
 if( WIN32 AND NOT CYGWIN )
   set(LLVM_LIT_TOOLS_DIR "" CACHE PATH "Path to GnuWin32 tools")