[dotest] Rename llvm-dotest -> lldb-dotest and make it a custom target

[JDevlieghere]

Summary

This renames llvm-dotest to lldb-dotest and makes it a custom target so
you can run ninja lldb-dotest to rebuild whatever is necessary before
rerunning the tests.

[davide]

LGTM

[zturner]

Shouldn’t it be lldb-dotest? I’m confused about what this target does

[davide]

The name should be changed (also the utility name), but that should be done separately.

[davide]

Also, I second the feeling of having lldb somewhere in the name for the utility (rather than llvm :)

[JDevlieghere]

Yeah, that's more sensible indeed. I must have had llvm-lit in mind and never gave it a second thought.

test/CMakeLists.txt

configure_file(
   )
 # We need this to expand the generator expressions.
 file(GENERATE
   OUTPUT
   $<TARGET_FILE_DIR:lldb>/llvm-dotest
   INPUT
   ${CMAKE_CURRENT_BINARY_DIR}/llvm-dotest.configured
   )
+# Make this a custom target.
+add_custom_target(llvm-dotest)
+add_dependencies(llvm-dotest ${LLDB_TEST_DEPS})
 
 # If we're building with an in-tree clang, then list clang as a dependency
 # to run tests.
 if (TARGET clang)
   add_dependencies(check-lldb clang)
 endif()
 
 # LLD is required to link test executables on Windows.